Fixup pending change log's formating
Fixes incorrect formatting in pending change log.
* Adds support for enabling and controlling the Client Side Metrics (CSM) reporting from the shared configuration files in addition to the environment variables.
### SDK Bugs
-=======
* `private/protocol`: Add protocol tests for blob types and headers ([#2770](https://github.com/aws/aws-sdk-go/pull/2770))
* Adds RESTJSON and RESTXML protocol tests for blob headers.
* Related to [#750](https://github.com/aws/aws-sdk-go/issues/750)
