Add PR 2395 to changelong
Add pending PR 2395 to changelog.
### SDK Features
### SDK Enhancements
+* `aws/endpoints`: Add customization for AWS GovCloud (US) Application Autoscalling ([#2395](https://github.com/aws/aws-sdk-go/pull/2395))
+ * Adds workaround to correct the endpoint for Application Autoscaling running in AWS GovCloud (US).
+ * Fixes [#2391](https://github.com/aws/aws-sdk-go/issues/2391)
### SDK Bugs
