Update helm chart

Bumping the helm chart with minor version bump, due to minor
version bump of the kured appVersion.

charts/kured/Chart.yaml

 apiVersion: v1
-appVersion: "1.5.1"
+appVersion: "1.6.1"
 description: A Helm chart for kured
 name: kured
-version: 2.2.4
+version: 2.3.0
 home: https://github.com/weaveworks/kured
 maintainers:
   - name: ckotzbauer

charts/kured/values.yaml

 image:
   repository: weaveworks/kured
-  tag: 1.5.1
+  tag: 1.6.1
   pullPolicy: IfNotPresent
   pullSecrets: []