1.2.21 release (previous 1.2.20) + release notes updated [ci skip]

CHANGELOG.md

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+<sup><sup>*Release notes were automatically generated by [Shipkit](http://shipkit.org/)*</sup></sup>
+
+#### 1.2.21
+ - 2020-08-26 - [1 commit](https://github.com/koral--/android-gif-drawable/compare/v1.2.20...v1.2.21) by [默默](https://github.com/wangqiang1588) - published to [![Bintray](https://img.shields.io/badge/Bintray-1.2.21-green.svg)](https://bintray.com/koral/maven/pl.droidsonroids.gif:android-gif-drawable/1.2.21)
+ - fix bug "Abort message: 'attempted to close file descriptor 165, expe… [(#747)](https://github.com/koral--/android-gif-drawable/pull/747)
+
 #### 1.2.20
  - Update NDK version to 21 [(#734)](https://github.com/koral--/android-gif-drawable/pull/734)
  - Fix artifacts when disposal to previous frame method is used

version.properties

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 #Version of the produced binaries. This file is intended to be checked-in.
 #It will be automatically bumped by release automation.
-version=1.2.21
-previousVersion=1.2.20
+version=1.2.22
+previousVersion=1.2.21