Update README.md

Author: Kuldeep Saxena

README.md

@@ -331,7 +331,9 @@ Its an another performance booster in RRF, it just holds the computation needed
 
 Yes, this library works with react-native also, currently it supports react-native `TextInput` and `Switch` component.
 
-
+### Note: 
+If you're using react-native then please add the following line of code in 'index.js' of your project to avoid error in android devices.
+`import "babel-polyfill"`
 
 
 Let's make React Reactive Forms better! If you're interested in helping, all contributions are welcome and appreciated.