Update chart changelog for v0.5.2
+## 0.5.2 (2018-12-20)
+
+### Improvements
+
+ - Updated Flux to `v1.8.2` and Helm operator to `v0.5.2`
+ [weaveworks/flux#1612](https://github.com/weaveworks/flux/pull/1612)
+ - Parameterized the memcached image repo
+ [weaveworks/flux#1592](https://github.com/weaveworks/flux/pull/1592)
+ - Allow existing service account to be provided on helm install
+ [weaveworks/flux#1589](https://github.com/weaveworks/flux/pull/1589)
+ - Make SSH known hosts volume optional
+ [weaveworks/flux#1544](https://github.com/weaveworks/flux/pull/1544)
+
## 0.5.1 (2018-11-21)
### Bug fixes
