Update babel7 to the latest version 🚀 (#943)

* chore(package): update @babel/polyfill to version 7.2.5

* chore(package): update lockfile package-lock.json

Author: greenkeeper[bot]

package-lock.json

@@ -51,7 +51,7 @@
     "@babel/plugin-proposal-decorators": "^7.2.3",
     "@babel/plugin-transform-regenerator": "7.0.0",
     "@babel/plugin-transform-runtime": "7.2.0",
-    "@babel/polyfill": "7.2.3",
+    "@babel/polyfill": "7.2.5",
     "@babel/preset-env": "7.2.3",
     "@babel/preset-react": "7.0.0",
     "@babel/runtime": "7.2.0",