Add exclude image PR in changelog
### Improvements
+ - Add option to exclude container images
+ [weaveworks/flux#1659](https://github.com/weaveworks/flux/pull/1659)
- Add option to mount custom `repositories.yaml`
[weaveworks/flux#1671](https://github.com/weaveworks/flux/pull/1671)
- Add option to limit the Helm operator to a single namespace
