Add `StatusBarDesignable` in readme
Add `StatusBarDesignable` in readme

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