Add PR  to pending changes
Adds PR to pending change log
* Fix [#2385](https://github.com/aws/aws-sdk-go/issue/2385)
### SDK Enhancements
+* `service/s3/s3manager/s3manageriface`: Add missing methods ([#2612](https://github.com/aws/aws-sdk-go/pull/2612))
+ * Adds the missing interface and methods from the `s3manager` Uploader, Downloader, and Batch Delete utilities.
### SDK Bugs
