Bump versions and update docs (#385)

Merged by k8s agent bot.

Author: NewRelic-K8s-Agents-Bot

charts/newrelic-k8s-metrics-adapter/Chart.yaml

@@ -1,8 +1,8 @@
 apiVersion: v2
 description: A Helm chart to deploy the New Relic Kubernetes Metrics Adapter.
 name: newrelic-k8s-metrics-adapter
-version: 1.13.5
-appVersion: 0.15.5
+version: 1.13.6
+appVersion: 0.15.6
 home: https://hub.docker.com/r/newrelic/newrelic-k8s-metrics-adapter
 sources:
   - https://github.com/newrelic/newrelic-k8s-metrics-adapter