Update CHANGELOG.md

Author: stack72

CHANGELOG.md

@@ -21,6 +21,7 @@ BUG FIXES:
 
  * core: Correct the previous fix for a bug causing "attribute not found" messages during destroy, as it was insufficient [GH-6599]
  * provider/aws: `aws_codedeploy_deployment_group` panic when setting `on_premises_instance_tag_filter` [GH-6617]
+ * provider/aws: Updating state when `aws_sns_topic_subscription` is missing [GH-6629]
  * provider/vsphere: `gateway` and `ipv6_gateway` are now read from `vsphere_virtual_machine` resources [GH-6522]
 
 ## 0.6.16 (May 9, 2016)