Merge release-v5.1 branch (#5266)

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package.json

@@ -1,7 +1,7 @@
 {
   "name": "openzeppelin-solidity",
   "description": "Secure Smart Contract library for Solidity",
-  "version": "5.0.2",
+  "version": "5.1.0",
   "private": true,
   "files": [
     "/contracts/**/*.sol",