ignore react for browserify build 
ignore react for browserify build 

A know issue with [browserify-cdn](https://www.google.co.in/search?q=browserify+cdn+peerdependencies&oq=browserify+cdn+pee&aqs=chrome.0.69i59j69i57j69i60.5598j1j7&sourceid=chrome&es_sm=91&ie=UTF-8), is that it fails on peerDependencies. As such, it tries to bundle react, doesn't find it installed, and [bails with an error](https://wzrd.in/standalone/react-motion) This should fix that.
keyanzhang/react-motion,dieface/react-motion,beni55/react-motion,souporserious/react-motion,besarthoxhaj/react-motion,danieldunderfelt/react-motion,beni55/react-motion,mcanthony/react-motion,jerelmiller/react-motion,oToUC/react-motion,keyanzhang/react-motion,bishopZ/react-motion,chenglou/react-motion,gre/react-motion,idibidiart/react-motion,bishopZ/react-motion,BenoitZugmeyer/preact-motion,royriojas/react-motion,dieface/react-motion,YikaJ/react-motion,hayeah/react-motion,oToUC/react-motion,mcanthony/react-motion,BenoitZugmeyer/preact-motion,wilfreddenton/react-motion,jerelmiller/react-motion,DanielHabib/react-motion,pairyo/react-motion,xyc/react-motion,YikaJ/react-motion,royriojas/react-motion,danieldunderfelt/react-motion,idibidiart/react-motion,pairyo/react-motion,DanielHabib/react-motion,chenglou/react-motion,besarthoxhaj/react-motion,wilfreddenton/react-motion,souporserious/react-motion,hayeah/react-motion,threepointone/react-motion,xyc/react-motion,threepointone/react-motion,jaredly/react-motion,jaredly/react-motion,KyleAMathews/react-motion,KyleAMathews/react-motion,gre/react-motion