lottie-ios breaking changes

• 4.0.0 \u2192 4.0.1breaking

  The new Core Animation rendering engine ([first introduced in Lottie 3.4.0](https://github.com/airbnb/lottie-ios/discussions/1627)) is now enabled by default for supported animations.

• 4.0.0 \u2192 4.0.1breaking

  Specifically, `LottieConfiguration.shared.renderingEngine` now defaults to `.automatic` instead of `.mainThread`. Animations that use features which are not supported by the Core Animation rendering engine will automatically fall back to using the original Main Thread rendering engine.

• 4.0.0 \u2192 4.0.1breaking

  When using the Core Animation rendering engine, Lottie animations now always animate smoothly regardless of the amount of work being done on the app’s main thread. This **significantly improves animation performance** while also eliminating CPU overhead.

• 4.0.0 \u2192 4.0.1breaking

  If you encounter any compatibility issues when using `RenderingEngineOption.automatic`, please file an issue with a copy of your animation json.

• 4.0.0 \u2192 4.0.1breaking

  `DecodingStrategy.dictionaryBased` is now enabled by default

• 3.5.0 \u2192 4.0.0breaking

  The new Core Animation rendering engine ([first introduced in Lottie 3.4.0](https://github.com/airbnb/lottie-ios/discussions/1627)) is now enabled by default for supported animations.

• 3.5.0 \u2192 4.0.0breaking

  Specifically, `LottieConfiguration.shared.renderingEngine` now defaults to `.automatic` instead of `.mainThread`. Animations that use features which are not supported by the Core Animation rendering engine will automatically fall back to using the original Main Thread rendering engine.

• 3.5.0 \u2192 4.0.0breaking

  When using the Core Animation rendering engine, Lottie animations now always animate smoothly regardless of the amount of work being done on the app’s main thread. This **significantly improves animation performance** while also eliminating CPU overhead.

• 3.5.0 \u2192 4.0.0breaking

  If you encounter any compatibility issues when using `RenderingEngineOption.automatic`, please file an issue with a copy of your animation json.

• 3.5.0 \u2192 4.0.0breaking

  `DecodingStrategy.dictionaryBased` is now enabled by default

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