Update changelog for Helm version bump

Author: jvassev

CHANGELOG.md

@@ -4,6 +4,8 @@
 
 * Core: extreme validation (#15): namespace configs are run in sandbox to catch more errors
 
+* Helm: export a K8S\_NODE\_NAME var to the fluentd container (@databus23). Chart version bumped to 0.2.2
+
 ## [1.4.0](https://github.com/vmware/kube-fluentd-operator/releases/tag/v1.4.0)
 
 * Fluentd: add `fluent-plugin-kinesis` to base image (@anton-107)