Modify CHANGELOG (#220)

Author: hgreebe

CHANGELOG.md

@@ -5,7 +5,6 @@
 **BUG FIX**
 
 * Fix an issue that was causing terraform-apply failure when ParallelCluster API 3.11.x is used to deploy clusters with login nodes.
-  https://github.com/aws/aws-parallelcluster/issues/6489
 
 ## 1.0.0