Update CHANGELOG.md

CHANGELOG.md

@@ -18,6 +18,7 @@ BUG FIXES:
 
 * builder/amazon-instance: Use S3Endpoint for ec2-upload-bundle arg,
   which works for every region. [GH-904]
+* builder/digitalocean: updated default image_id [GH-1032]
 * builder/virtualbox-iso: Retry unregister a few times to deal with
   VBoxManage randomness. [GH-915]
 * provisioners/chef-client: Don't chown directory with Ubuntu. [GH-939]