fix(travis): travis now supports yarn first-class
fix(travis): travis now supports yarn first-class

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