Update dependency prop-types to v15.6.2

Author: renovate-bot

package-lock.json

@@ -129,7 +129,7 @@
     "postcss-flexbugs-fixes": "3.3.1",
     "postcss-loader": "2.1.6",
     "pre-commit": "1.2.2",
-    "prop-types": "15.6.1",
+    "prop-types": "15.6.2",
     "react": "16.4.1",
     "react-dom": "16.4.1",
     "react-hot-loader": "4.3.3",