v2.0.1

• Added better support for delayed tweens, including an example in examples/delayed_tween.rs
• Added new_at which situations a tween in time. Added similar methods for shortcut constructors, such as
  support for sine_in_at.
• Fixed the new method for most Tweens and added support for Copy, Ord, and Eq.
• Added support for Copy, Ord, and Eq to all Tweener adapters.
• Upgraded all math libraries