Fix dependency warnings (#1053)

* update package-lock generated by npm

* run npm audit fix

package.json

@@ -37,29 +37,29 @@
   },
   "homepage": "https://github.com/OpenZeppelin/zeppelin-solidity",
   "devDependencies": {
-    "babel-polyfill": "^6.23.0",
+    "babel-polyfill": "^6.26.0",
     "babel-preset-es2015": "^6.18.0",
     "babel-preset-stage-2": "^6.18.0",
     "babel-preset-stage-3": "^6.17.0",
-    "babel-register": "^6.23.0",
-    "chai": "^4.0.2",
+    "babel-register": "^6.26.0",
+    "chai": "^4.1.2",
     "chai-as-promised": "^7.0.0",
-    "chai-bignumber": "^2.0.0",
-    "coveralls": "^2.13.1",
+    "chai-bignumber": "^2.0.2",
+    "coveralls": "^3.0.1",
     "dotenv": "^4.0.0",
-    "eslint": "^4.11.0",
+    "eslint": "^4.19.1",
     "eslint-config-standard": "^10.2.1",
-    "eslint-plugin-import": "^2.8.0",
+    "eslint-plugin-import": "^2.13.0",
     "eslint-plugin-node": "^5.2.1",
-    "eslint-plugin-promise": "^3.6.0",
-    "eslint-plugin-standard": "^3.0.1",
-    "ethereumjs-util": "^5.1.2",
+    "eslint-plugin-promise": "^3.8.0",
+    "eslint-plugin-standard": "^3.1.0",
+    "ethereumjs-util": "^5.2.0",
     "ethjs-abi": "^0.2.1",
     "ganache-cli": "6.1.0",
-    "solidity-coverage": "^0.5.0",
+    "solidity-coverage": "^0.5.4",
     "solium": "^1.1.7",
     "truffle": "^4.1.11",
-    "truffle-hdwallet-provider": "0.0.3",
+    "truffle-hdwallet-provider": "0.0.5",
     "web3-utils": "^1.0.0-beta.34"
   }
 }