Update CHANGELOG.md

Author: stack72

CHANGELOG.md

@@ -46,6 +46,7 @@ BUG FIXES:
  * provider/aws: guard against aws_route53_record delete panic [GH-9049]
  * provider/aws: aws_db_option_group flattenOptions failing due to missing values [GH-9052]
  * provider/aws: Add retry logic to the aws_ecr_repository delete func [GH-9050]
+ * provider/aws: Modifying the parameter_group_name of aws_elasticache_replication_group caused a panic [GH-9101]
  * provider/librato: Mandatory name and conditions attributes weren't being sent on Update unless changed [GH-8984]