Update CHANGELOG.md

Author: stack72

CHANGELOG.md

@@ -20,6 +20,7 @@ BUG FIXES:
 
  * provider/aws: Fix panic when querying VPC's main route table via data source ([#11134](https://github.com/hashicorp/terraform/issues/11134))
  * provider/aws: Allow creating aws_codecommit repository outside of us-east-1 [GH-11177]
+ * provider/ignition: allowing empty systemd.content when a dropin is provided [GH-11216]
 
 ## 0.8.4 (January 11, 2017)