2.1.0 Release

• Bug fixes

• Fixed issues with adding custom subviews to a Lottie animation

• Added Convenience initializers to LOTComposition
  LOTCompositions can now be easily initialized and set on a pre-existing LOTAnimationView
• Added Interactive LOTAnimatedControl and LOTAnimatedSwitch
  New animated toggle switches and buttons! Check out the api here
  https://github.com/airbnb/lottie-ios#animated-controls-and-switches