fix: move babel-polyfill to dependency

Signed-off-by: BoHong Li <a60814billy@gmail.com>

Author: a60814billy

package.json

@@ -38,6 +38,7 @@
     "async": "~2.1.4",
     "aws-sdk": "~2.345.0",
     "azure-storage": "~2.10.2",
+    "babel-polyfill": "~6.26.0",
     "base64url": "~3.0.0",
     "body-parser": "~1.18.3",
     "bootstrap": "~3.4.0",
@@ -145,7 +146,6 @@
     "babel-core": "~6.26.3",
     "babel-loader": "~7.1.4",
     "babel-plugin-transform-runtime": "~6.23.0",
-    "babel-polyfill": "~6.26.0",
     "babel-preset-env": "~1.7.0",
     "babel-runtime": "~6.26.0",
     "copy-webpack-plugin": "~4.5.2",