Fixes for PropTypes and React.createClass deprecation changes in Reac…

[ChrisHughes]

…t-Native

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[mo-solnet]

Somone please merge this 🙏 🙇 . It's blocking migration to latest react-native for projects using the Navigator from this package.

[cmmouritsen]

@hramos I see that you have merged this pr. Are there any plans to do an update to the npm package to include this change?