Please update support for react-native latest

[Saumyadip-Pramanik]

Undefined error occurs everywhere. Please Update.

[voratham]

@Saumyadip-Pramanik
You can see from https://github.com/huowenxuan/react-native-media-kit
then you must fix PropTypes within a library that calls it.

I test on react-native version 0.50.4, react version 16 but test on ios only.