Add `NavigationBarDesignable` in readme
Add `NavigationBarDesignable` in readme

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