Update package.json

Author: Kuldeep Saxena

package.json

@@ -51,7 +51,8 @@
   },
   "peerDependencies": {
     "react": "^15.0.0-0 || ^16.0.0-0",
-    "prop-types": "^15.6.0"
+    "prop-types": "^15.6.0",
+    "babel-polyfill": "^6.26.0"
   },
   "typings": "./index.d.ts",
   "homepage": "https://github.com/bietkul/react-reactive-form#readme"