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

Closes #6

Author: greenkeeper[bot]

package.json

@@ -27,7 +27,7 @@
     "@babel/plugin-proposal-export-namespace-from": "7.2.0",
     "@babel/plugin-syntax-dynamic-import": "7.2.0",
     "@babel/plugin-transform-runtime": "7.3.4",
-    "@babel/polyfill": "7.0.0",
+    "@babel/polyfill": "7.2.5",
     "@babel/preset-env": "7.1.5",
     "@babel/register": "7.0.0",
     "@babel/runtime": "7.1.5",