fix(react): fix componentWillMount 16.9 deprecation
fix(react): fix componentWillMount 16.9 deprecation

Fixes #420

STRML/react-draggable,mzabriskie/react-draggable,mzabriskie/react-draggable,mzabriskie/react-draggable,STRML/react-draggable,STRML/react-draggable