Update README.md to version 2.0
Update README.md to version 2.0

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