Update CHANGELOG.md

CHANGELOG.md

@@ -4,6 +4,7 @@ IMPROVEMENTS:
 
   * builder/amazon-ebs: Support encrypted EBS volumes [GH-1194]
   * builder/ansible: Add `playbook_dir` option. [GH-1000]
+  * builder/openstack: Add ability to configure networks. [GH-1261]
   * builder/openstack: Skip certificate verification. [GH-1121]
   * builder/virtualbox/all: Attempt to use local guest additions ISO
       before downloading from internet. [GH-1123]