Add the support of Carthage in Readme.md
Add the support of Carthage in Readme.md

alexiosdev/IBAnimatable,seanwoodward/IBAnimatable,JakeLin/IBAnimatable,IBAnimatable/IBAnimatable,alexiosdev/IBAnimatable,seanwoodward/IBAnimatable,IBAnimatable/IBAnimatable,JakeLin/IBAnimatable,IBAnimatable/IBAnimatable