Add Flux and helm-op versions to changelog
### Improvements
+ - Updated Flux to `1.10.0` and Helm operator to `0.6.0`
+ [weaveworks/flux#1713](https://github.com/weaveworks/flux/pull/1713)
- Add option to exclude container images
[weaveworks/flux#1659](https://github.com/weaveworks/flux/pull/1659)
- Add option to mount custom `repositories.yaml`
