chore(release): Update CHANGELOG (#2136)

* chore(release): Update CHANGELOG

* Update CHANGELOG.md

Co-authored-by: Richard McClellan <[email protected]>

Co-authored-by: Richard McClellan <[email protected]>

Author: rjuliano

CHANGELOG.md

@@ -1,5 +1,14 @@
 # Change Log - AWS SDK for Android
 
+## [Release TBD](https://github.com/aws/aws-sdk-android/releases/tag/TBD)
+
+- Model updates
+  - AWS Simple Token Service [#2132](https://github.com/aws-amplify/aws-sdk-android/pull/2132)
+  - AWS Comprehend [#2122](https://github.com/aws-amplify/aws-sdk-android/pull/2122)
+  - AWS Transcribe [#2127](https://github.com/aws-amplify/aws-sdk-android/pull/2127)
+  - AWS Translate [#2125](https://github.com/aws-amplify/aws-sdk-android/pull/2125)
+  - AWS Textract [#2128](https://github.com/aws-amplify/aws-sdk-android/pull/2128)
+
 ## [Release 2.19.0](https://github.com/aws/aws-sdk-android/releases/tag/release_v2.19.0)
 
 ## Bug Fixes