fix: upgrade react from 15.3.1 to 15.6.2

Snyk has created this PR to upgrade react from 15.3.1 to 15.6.2.

See this package in NPM:
https://www.npmjs.com/package/react

See this project in Snyk:
https://app.snyk.io/org/github-open-source/project/08580380-14ad-4abd-b4d4-2b6504e7c69a?utm_source=github&utm_medium=upgrade-pr

Example/package.json

@@ -6,7 +6,7 @@
     "start": "node node_modules/react-native/local-cli/cli.js start"
   },
   "dependencies": {
-    "react": "15.3.1",
+    "react": "15.6.2",
     "react-native": "^0.33.0",
     "react-native-admob": "../"
   }