Update deprecated dependencies

[dflourusso]

Warning: PropTypes has been moved to a separate package. Accessing React.PropTypes is no longer supported and will be removed completely in React 16. Use the prop-types package on npm instead. (https://fb.me/migrating-from-react-proptypes)

[pintocarlos]

This is also causing the package to break for me as I am already using React 16. @ldn0x7dc can you please take a look?
PropTypes from React were deprecated a while back now.
Please update to use the npm package 'prop-types'.

[pintocarlos]

#30 Added a PR for your review on this module as well. @ldn0x7dc Please review and merge. Thank you!

[pintocarlos]

@ldn0x7dc hey any chance you can review and merge?

[xcarpentier]

I've been created a fork of it for my own project to fix it, here:
https://www.npmjs.com/package/@applications-developer/react-native-transformable-image

[xstable]

@xcarpentier As this repo seems not to be maintained anymore, I suggest to take this over to react-native-community.

@ldn0x7dc are you agree (or are you still there... have seen that you more than one year doesn't have any activity on Github) Hope you are doing well!

@xcarpentier maybe you can suggest react-native-community to take your fork, so that we can based on this merge all the following pull-requests.