Revert Solidity version bump. (#1729)

(cherry picked from commit 67bca857)

CHANGELOG.md

@@ -8,7 +8,7 @@
  * All contracts now have revert reason strings, which give insight into error conditions, and help debug failing transactions. ([#1704](https://github.com/OpenZeppelin/openzeppelin-solidity/pull/1704))
 
 ### Improvements:
- * Upgraded the minimum compiler version to v0.5.7: this prevents users from encountering compiler bugs that were fixed in this version. ([#1724](https://github.com/OpenZeppelin/openzeppelin-solidity/pull/1724))
+ * Reverted the Solidity version bump done in v2.2.0, setting the minimum compiler version to v0.5.0, to prevent unexpected build breakage. Users are encouraged however to stay on top of new compiler releases, which usually include bugfixes. ([#1728](https://github.com/OpenZeppelin/openzeppelin-solidity/pull/1728))
 
 ### Bugfixes:
  * `PostDeliveryCrowdsale`: some validations where skipped when paired with other crowdsale flavors, such as `AllowanceCrowdsale`, or `MintableCrowdsale` and `ERC20Capped`, which could cause buyers to not be able to claim their purchased tokens. ([#1721](https://github.com/OpenZeppelin/openzeppelin-solidity/pull/1721))

contracts/access/Roles.sol

-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 /**
  * @title Roles

contracts/access/roles/CapperRole.sol

-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../Roles.sol";
 

contracts/access/roles/MinterRole.sol

-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../Roles.sol";
 

contracts/access/roles/PauserRole.sol

-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../Roles.sol";
 

contracts/access/roles/SignerRole.sol

-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../Roles.sol";
 

contracts/access/roles/WhitelistAdminRole.sol

-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../Roles.sol";
 

contracts/access/roles/WhitelistedRole.sol

-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../Roles.sol";
 import "./WhitelistAdminRole.sol";

contracts/crowdsale/Crowdsale.sol

-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../token/ERC20/IERC20.sol";
 import "../math/SafeMath.sol";

contracts/crowdsale/distribution/FinalizableCrowdsale.sol

-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../../math/SafeMath.sol";
 import "../validation/TimedCrowdsale.sol";

contracts/crowdsale/distribution/PostDeliveryCrowdsale.sol

-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../validation/TimedCrowdsale.sol";
 import "../../math/SafeMath.sol";

contracts/crowdsale/distribution/RefundableCrowdsale.sol

-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../../math/SafeMath.sol";
 import "./FinalizableCrowdsale.sol";

contracts/crowdsale/distribution/RefundablePostDeliveryCrowdsale.sol

-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "./RefundableCrowdsale.sol";
 import "./PostDeliveryCrowdsale.sol";

contracts/crowdsale/emission/AllowanceCrowdsale.sol

-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../Crowdsale.sol";
 import "../../token/ERC20/IERC20.sol";

contracts/crowdsale/emission/MintedCrowdsale.sol

-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../Crowdsale.sol";
 import "../../token/ERC20/ERC20Mintable.sol";

contracts/crowdsale/price/IncreasingPriceCrowdsale.sol

-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../validation/TimedCrowdsale.sol";
 import "../../math/SafeMath.sol";

contracts/crowdsale/validation/CappedCrowdsale.sol

-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../../math/SafeMath.sol";
 import "../Crowdsale.sol";

contracts/crowdsale/validation/IndividuallyCappedCrowdsale.sol

-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../../math/SafeMath.sol";
 import "../Crowdsale.sol";

contracts/crowdsale/validation/PausableCrowdsale.sol

-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../Crowdsale.sol";
 import "../../lifecycle/Pausable.sol";

contracts/crowdsale/validation/TimedCrowdsale.sol

-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../../math/SafeMath.sol";
 import "../Crowdsale.sol";

contracts/crowdsale/validation/WhitelistCrowdsale.sol

-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 import "../Crowdsale.sol";
 import "../../access/roles/WhitelistedRole.sol";
 

contracts/cryptography/ECDSA.sol

-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 /**
  * @title Elliptic curve signature operations

contracts/cryptography/MerkleProof.sol

-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 /**
  * @title MerkleProof

contracts/drafts/Counters.sol

-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../math/SafeMath.sol";
 

contracts/drafts/ERC1046/ERC20Metadata.sol

-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../../token/ERC20/IERC20.sol";
 

contracts/drafts/ERC1820Implementer.sol

-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "./IERC1820Implementer.sol";
 

contracts/drafts/ERC20Migrator.sol

-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../token/ERC20/IERC20.sol";
 import "../token/ERC20/ERC20Mintable.sol";

contracts/drafts/ERC20Snapshot.sol

-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../math/SafeMath.sol";
 import "../utils/Arrays.sol";

contracts/drafts/ERC777/ERC777.sol

-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "./IERC777.sol";
 import "./IERC777Recipient.sol";

contracts/drafts/ERC777/IERC777.sol

-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 /**
  * @title ERC777 token interface

contracts/drafts/ERC777/IERC777Recipient.sol

-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 /**
  * @title ERC777 token recipient interface

contracts/drafts/ERC777/IERC777Sender.sol

-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 /**
  * @title ERC777 token sender interface

contracts/drafts/IERC1820Implementer.sol

-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 /**
  * @title IERC1820Implementer

contracts/drafts/IERC1820Registry.sol

-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 /**
  * @title ERC1820 Pseudo-introspection Registry Contract

contracts/drafts/SignatureBouncer.sol

-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../access/roles/SignerRole.sol";
 import "../cryptography/ECDSA.sol";

contracts/drafts/SignedSafeMath.sol

-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 /**
  * @title SignedSafeMath

contracts/drafts/TokenVesting.sol

-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../token/ERC20/SafeERC20.sol";
 import "../ownership/Ownable.sol";

contracts/examples/SampleCrowdsale.sol

-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../crowdsale/validation/CappedCrowdsale.sol";
 import "../crowdsale/distribution/RefundableCrowdsale.sol";

contracts/examples/SimpleToken.sol

-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../token/ERC20/ERC20.sol";
 import "../token/ERC20/ERC20Detailed.sol";

contracts/introspection/ERC165.sol

-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "./IERC165.sol";
 

contracts/introspection/ERC165Checker.sol

-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 /**
  * @title ERC165Checker

contracts/introspection/IERC165.sol

-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 /**
  * @title IERC165

contracts/lifecycle/Pausable.sol

-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../access/roles/PauserRole.sol";
 

contracts/math/Math.sol

-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 /**
  * @title Math

contracts/math/SafeMath.sol

-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 /**
  * @title SafeMath

contracts/mocks/AddressImpl.sol

-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../utils/Address.sol";
 

contracts/mocks/AllowanceCrowdsaleImpl.sol

-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../token/ERC20/IERC20.sol";
 import "../crowdsale/emission/AllowanceCrowdsale.sol";

contracts/mocks/ArraysImpl.sol

-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../utils/Arrays.sol";
 

contracts/mocks/CappedCrowdsaleImpl.sol

-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../token/ERC20/IERC20.sol";
 import "../crowdsale/validation/CappedCrowdsale.sol";

contracts/mocks/CapperRoleMock.sol

-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../access/roles/CapperRole.sol";
 

contracts/mocks/ConditionalEscrowMock.sol

-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../payment/escrow/ConditionalEscrow.sol";
 

contracts/mocks/CountersImpl.sol

-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../drafts/Counters.sol";
 

contracts/mocks/CrowdsaleMock.sol

-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../crowdsale/Crowdsale.sol";
 

contracts/mocks/ECDSAMock.sol

-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../cryptography/ECDSA.sol";
 

contracts/mocks/ERC165/ERC165InterfacesSupported.sol

-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../../introspection/IERC165.sol";
 

contracts/mocks/ERC165/ERC165NotSupported.sol

-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 contract ERC165NotSupported {
     // solhint-disable-previous-line no-empty-blocks

contracts/mocks/ERC165CheckerMock.sol

-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../introspection/ERC165Checker.sol";
 

contracts/mocks/ERC165Mock.sol

-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../introspection/ERC165.sol";
 

contracts/mocks/ERC1820ImplementerMock.sol

-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../drafts/ERC1820Implementer.sol";
 

contracts/mocks/ERC20BurnableMock.sol

-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../token/ERC20/ERC20Burnable.sol";
 

contracts/mocks/ERC20DetailedMock.sol

-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../token/ERC20/ERC20.sol";
 import "../token/ERC20/ERC20Detailed.sol";

contracts/mocks/ERC20MetadataMock.sol

-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../token/ERC20/ERC20.sol";
 import "../drafts/ERC1046/ERC20Metadata.sol";

contracts/mocks/ERC20MintableMock.sol

-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../token/ERC20/ERC20Mintable.sol";
 import "./MinterRoleMock.sol";

contracts/mocks/ERC20Mock.sol

-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../token/ERC20/ERC20.sol";
 

contracts/mocks/ERC20PausableMock.sol

-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../token/ERC20/ERC20Pausable.sol";
 import "./PauserRoleMock.sol";

contracts/mocks/ERC20SnapshotMock.sol

-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../drafts/ERC20Snapshot.sol";
 

contracts/mocks/ERC721FullMock.sol

-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../token/ERC721/ERC721Full.sol";
 import "../token/ERC721/ERC721Mintable.sol";

contracts/mocks/ERC721MintableBurnableImpl.sol

-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../token/ERC721/ERC721Full.sol";
 import "../token/ERC721/ERC721Mintable.sol";

contracts/mocks/ERC721Mock.sol

-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../token/ERC721/ERC721.sol";
 

contracts/mocks/ERC721PausableMock.sol

-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../token/ERC721/ERC721Pausable.sol";
 import "./PauserRoleMock.sol";

contracts/mocks/ERC721ReceiverMock.sol

-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../token/ERC721/IERC721Receiver.sol";
 

contracts/mocks/ERC777Mock.sol

-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../drafts/ERC777/ERC777.sol";
 

contracts/mocks/ERC777SenderRecipientMock.sol

-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../drafts/ERC777/IERC777.sol";
 import "../drafts/ERC777/IERC777Sender.sol";

contracts/mocks/FinalizableCrowdsaleImpl.sol

-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../token/ERC20/IERC20.sol";
 import "../crowdsale/distribution/FinalizableCrowdsale.sol";

contracts/mocks/IncreasingPriceCrowdsaleImpl.sol

-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../crowdsale/price/IncreasingPriceCrowdsale.sol";
 import "../math/SafeMath.sol";

contracts/mocks/IndividuallyCappedCrowdsaleImpl.sol

-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../token/ERC20/IERC20.sol";
 import "../crowdsale/validation/IndividuallyCappedCrowdsale.sol";

contracts/mocks/MathMock.sol

-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../math/Math.sol";
 

contracts/mocks/MerkleProofWrapper.sol

-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import { MerkleProof } from "../cryptography/MerkleProof.sol";
 

contracts/mocks/MintedCrowdsaleImpl.sol

-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../token/ERC20/ERC20Mintable.sol";
 import "../crowdsale/emission/MintedCrowdsale.sol";

contracts/mocks/MinterRoleMock.sol

-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../access/roles/MinterRole.sol";
 

contracts/mocks/OwnableInterfaceId.sol

-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../ownership/Ownable.sol";
 

contracts/mocks/OwnableMock.sol

-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../ownership/Ownable.sol";
 

contracts/mocks/PausableCrowdsaleImpl.sol

-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../token/ERC20/ERC20.sol";
 import "../crowdsale/validation/PausableCrowdsale.sol";

contracts/mocks/PausableMock.sol

-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../lifecycle/Pausable.sol";
 import "./PauserRoleMock.sol";

contracts/mocks/PauserRoleMock.sol

-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../access/roles/PauserRole.sol";
 

contracts/mocks/PostDeliveryCrowdsaleImpl.sol

-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../token/ERC20/IERC20.sol";
 import "../crowdsale/distribution/PostDeliveryCrowdsale.sol";

contracts/mocks/PullPaymentMock.sol

-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../payment/PullPayment.sol";
 

contracts/mocks/ReentrancyAttack.sol

-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 contract ReentrancyAttack {
     function callSender(bytes4 data) public {

contracts/mocks/ReentrancyMock.sol

-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../utils/ReentrancyGuard.sol";
 import "./ReentrancyAttack.sol";

contracts/mocks/RefundableCrowdsaleImpl.sol

-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../token/ERC20/IERC20.sol";
 import "../crowdsale/distribution/RefundableCrowdsale.sol";

contracts/mocks/RefundablePostDeliveryCrowdsaleImpl.sol

-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../token/ERC20/IERC20.sol";
 import "../crowdsale/distribution/RefundablePostDeliveryCrowdsale.sol";

contracts/mocks/RolesMock.sol

-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../access/Roles.sol";
 

contracts/mocks/SafeERC20Helper.sol

-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../token/ERC20/IERC20.sol";
 import "../token/ERC20/SafeERC20.sol";

contracts/mocks/SafeMathMock.sol

-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../math/SafeMath.sol";
 

contracts/mocks/SecondaryMock.sol

-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../ownership/Secondary.sol";
 

contracts/mocks/SignatureBouncerMock.sol

-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../drafts/SignatureBouncer.sol";
 import "./SignerRoleMock.sol";

contracts/mocks/SignedSafeMathMock.sol

-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../drafts/SignedSafeMath.sol";
 

contracts/mocks/SignerRoleMock.sol

-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../access/roles/SignerRole.sol";
 

contracts/mocks/TimedCrowdsaleImpl.sol

-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../token/ERC20/IERC20.sol";
 import "../crowdsale/validation/TimedCrowdsale.sol";

contracts/mocks/WhitelistAdminRoleMock.sol

-pragma solidity ^0.5.7;
+pragma solidity ^0.5.0;
 
 import "../access/roles/WhitelistAdminRole.sol";