Add changelog

CHANGELOG_PENDING.md

@@ -1,9 +1,7 @@
 ### SDK Features
-* `services/transcribestreamingservice`: Support for Amazon Transcribe Streaming ([#3048](https://github.com/aws/aws-sdk-go/pull/3048))
-  * The SDK now supports the Amazon Transcribe Streaming APIs by utilizing event stream encoding over HTTP/2
-  * See [Amazon Transcribe Developer Guide](https://docs.aws.amazon.com/transcribe/latest/dg)
-  * Fixes [#2487](https://github.com/aws/aws-sdk-go/issues/2487)
 
 ### SDK Enhancements
+* `service/s3/s3crypto`: Added X-Ray support to encrypt/decrypt clients ([#2912](https://github.com/aws/aws-sdk-go/pull/2912))
+  * Adds support for passing Context down to the crypto client's KMS client enabling tracing for tools like X-Ray, and metrics.
 
 ### SDK Bugs