Kippy v0.6.3

• Added rollup for bundling and minification.
• Removed weird index.js and index.d.ts.

Kippy v0.6.1

• Physics engine now wakes entity if velocity is above threshold.
• Input now clears at the end of the frame, the old order makes isKeyPressed and isKeyReleased unusable.
• Added Flappy Bird example.

Kippy v0.6.0

• Added box collider.
• Disabled rotation impulse in the physics engine for now because box collider rotation would need complex polygon collider which is not implemented yet.