Fix helm chart to point to the latest docker image tag (#1381)

* Update Chart to 0.6.0 docker tag

* Upgrade app version to 0.6.0

* Bump version to 0.3.3

charts/athens-proxy/Chart.yaml

@@ -1,6 +1,6 @@
 name: athens-proxy
-version: 0.3.2
-appVersion: 0.5.0
+version: 0.3.3
+appVersion: 0.6.0
 description: The proxy server for Go modules
 icon: https://raw.githubusercontent.com/gomods/athens/master/docs/static/banner.png
 keywords:

charts/athens-proxy/values.yaml

@@ -2,7 +2,7 @@ replicaCount: 1
 image:
   registry: docker.io
   repository: gomods/athens
-  tag: v0.5.0
+  tag: v0.6.0
 
   ## Specify a imagePullPolicy
   ## Defaults to 'Always' if image tag is 'latest', else set to 'IfNotPresent'