Merge branch 'release-v3.2.0' into master

CHANGELOG.md

 # Changelog
 
-## 3.2.0 (unreleased)
+## 3.2.0 (2020-09-10)
 
 ### New features
  * Proxies: added the proxy contracts from OpenZeppelin SDK. ([#2335](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/2335))

contracts/package.json

 {
   "name": "@openzeppelin/contracts",
-  "version": "3.1.0",
+  "version": "3.2.0",
   "description": "Secure Smart Contract library for Solidity",
   "files": [
     "**/*.sol",

package.json

 {
   "name": "openzeppelin-solidity",
-  "version": "3.1.0",
+  "version": "3.2.0",
   "description": "Secure Smart Contract library for Solidity",
   "files": [
     "/contracts/**/*.sol",