bump version to 0.3.0 for helm 3

Author: sstarcher

plugin.yaml

@@ -1,5 +1,5 @@
 name: "release"
-version: "0.2.2"
+version: "0.3.0"
 usage: "Determines the charts next release number"
 description: |-
   This plugin will use environment variables and git history to divine the next chart version.