Warning from using deprecated react code

[Mark Sun]

Hi, I got these two warning from using Tappable.
Warning: Accessing PropTypes via the main React package is deprecated. Use the prop-types package from npm instead.
Warning: Tappable: React.createClass is deprecated and will be removed in version 16. Use plain JavaScript classes instead. If you're not yet ready to migrate, create-react-class is available on npm as a drop-in replacement.
Not sure if this is already tracked. Just a reminder. Thank you.

[Daniel Cousens]

Hi @mark-sun,

This has already been fixed and merged in #101

Please help to get this published by +1 the following issue: #103