docs: add CHANGELOG for new version.

Author: errnull

CHANGELOG.md

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+#  (2019-06-19)
+
+
+### Bug Fixes
+
+* correct demo. ([639bbee](https://github.com/yyued/SVGAPlayer-iOS/commit/639bbee))
+* correct image key. ([6436935](https://github.com/yyued/SVGAPlayer-iOS/commit/6436935))
+* fix key for svga 1.x format. ([ec43259](https://github.com/yyued/SVGAPlayer-iOS/commit/ec43259))
+* fix key recognized. ([5987e91](https://github.com/yyued/SVGAPlayer-iOS/commit/5987e91))
+* fix layer level. ([0318580](https://github.com/yyued/SVGAPlayer-iOS/commit/0318580))
+* return when videoItem is nil in startAnimation. ([cb27f0f](https://github.com/yyued/SVGAPlayer-iOS/commit/cb27f0f))
+* same image key sprite. ([95ad82b](https://github.com/yyued/SVGAPlayer-iOS/commit/95ad82b))
+* update 2.x proto support for matte. ([bc2de2a](https://github.com/yyued/SVGAPlayer-iOS/commit/bc2de2a))
+
+
+### Features
+
+* add 2.x proto support for matte. ([6ec6b29](https://github.com/yyued/SVGAPlayer-iOS/commit/6ec6b29))
+* add 2.x proto support for matte. ([527e76f](https://github.com/yyued/SVGAPlayer-iOS/commit/527e76f))
+* add slider for animation demo. ([fc9d7ef](https://github.com/yyued/SVGAPlayer-iOS/commit/fc9d7ef))
+* support bitmap matte layer. ([4c4e2b1](https://github.com/yyued/SVGAPlayer-iOS/commit/4c4e2b1))
+* support muti mask. ([188c1b3](https://github.com/yyued/SVGAPlayer-iOS/commit/188c1b3))
+* update 2.x proto support for matte. ([2b28845](https://github.com/yyued/SVGAPlayer-iOS/commit/2b28845))
+* update pods version. ([b303672](https://github.com/yyued/SVGAPlayer-iOS/commit/b303672))
+
+
+
+## [2.3.3](https://github.com/yyued/SVGAPlayer-iOS/compare/2.3.2...2.3.3) (2019-03-04)
+
+
+
+## [2.3.2](https://github.com/yyued/SVGAPlayer-iOS/compare/2.3.1...2.3.2) (2018-12-26)
+
+
+### Bug Fixes
+
+* Rollback SSZipArchive to 1.8.1 because of crash. ([2f9d94b](https://github.com/yyued/SVGAPlayer-iOS/commit/2f9d94b))
+
+
+
+## [2.3.1](https://github.com/yyued/SVGAPlayer-iOS/compare/2.3.0...2.3.1) (2018-12-18)
+
+
+### Bug Fixes
+
+* add enabledMemoryCache option to SVGAParser, disable memory cache to default. ([116a91f](https://github.com/yyued/SVGAPlayer-iOS/commit/116a91f))
+
+
+
+# [2.3.0](https://github.com/yyued/SVGAPlayer-iOS/compare/2.1.4...2.3.0) (2018-11-01)
+
+
+
+## [2.1.4](https://github.com/yyued/SVGAPlayer-iOS/compare/2.1.3...2.1.4) (2018-07-23)
+
+
+
+## [2.1.3](https://github.com/yyued/SVGAPlayer-iOS/compare/2.1.2...2.1.3) (2018-04-25)
+
+
+
+## [2.1.2](https://github.com/yyued/SVGAPlayer-iOS/compare/2.1.1...2.1.2) (2018-03-28)
+
+
+
+## [2.1.1](https://github.com/yyued/SVGAPlayer-iOS/compare/2.1.0...2.1.1) (2018-02-08)
+
+
+
+# [2.1.0](https://github.com/yyued/SVGAPlayer-iOS/compare/2.1.0-Beta...2.1.0) (2018-01-15)
+
+
+
+# [2.1.0-Beta](https://github.com/yyued/SVGAPlayer-iOS/compare/2.0.1...2.1.0-Beta) (2017-12-29)
+
+
+
+## [2.0.1](https://github.com/yyued/SVGAPlayer-iOS/compare/2.0.0...2.0.1) (2017-11-08)
+
+
+
+# [2.0.0](https://github.com/yyued/SVGAPlayer-iOS/compare/1.1.7...2.0.0) (2017-10-23)
+
+
+
+## [1.1.7](https://github.com/yyued/SVGAPlayer-iOS/compare/1.1.6...1.1.7) (2017-09-19)
+
+
+
+## [1.1.6](https://github.com/yyued/SVGAPlayer-iOS/compare/1.1.5...1.1.6) (2017-09-07)
+
+
+
+## [1.1.5](https://github.com/yyued/SVGAPlayer-iOS/compare/1.1.4...1.1.5) (2017-08-21)
+
+
+
+## [1.1.4](https://github.com/yyued/SVGAPlayer-iOS/compare/1.1.3...1.1.4) (2017-08-21)
+
+
+
+## [1.1.3](https://github.com/yyued/SVGAPlayer-iOS/compare/1.1.2...1.1.3) (2017-08-18)
+
+
+
+## [1.1.2](https://github.com/yyued/SVGAPlayer-iOS/compare/1.1.1...1.1.2) (2017-06-19)
+
+
+
+## [1.1.1](https://github.com/yyued/SVGAPlayer-iOS/compare/1.1.0...1.1.1) (2017-03-30)
+
+
+
+# [1.1.0](https://github.com/yyued/SVGAPlayer-iOS/compare/1.1.0-beta...1.1.0) (2017-03-17)
+
+
+
+# [1.1.0-beta](https://github.com/yyued/SVGAPlayer-iOS/compare/0.1.0...1.1.0-beta) (2017-02-22)
+
+
+
+# [0.1.0](https://github.com/yyued/SVGAPlayer-iOS/compare/0.0.3...0.1.0) (2016-10-13)
+
+
+
+## [0.0.3](https://github.com/yyued/SVGAPlayer-iOS/compare/0.0.2...0.0.3) (2016-10-08)
+
+
+
+## [0.0.2](https://github.com/yyued/SVGAPlayer-iOS/compare/0.0.1...0.0.2) (2016-08-03)
+
+
+
+## 0.0.1 (2016-06-17)
+
+
+