Update to react-0.16

[rofrol]

https://blog.boon.gl/2017/11/28/react-elm-wrapper.html

[andys8]

There is no leading zero in react's version ;)

[Parasrah]

From what I understand looking at this issue, it is simply regarding updating the React dev dependency, and has nothing to do with the versions of React this library supports. The only reason I bring this up is people have been starting to use my library, not because of the different API it offers, but because they thought this issue indicated a lack of support for newer versions of React. It might be good to update the title to clarify this

Edit: after reading that blog post (didn't load to me when I first tried) I might be misunderstanding, and this library might not work for newer versions of React?