Bump helm chart versions post 2.8 release

Change-Id: Iacded169e9193dce471ca2099fd1dc817e6bf58b
diff --git a/voltha-stack/Chart.yaml b/voltha-stack/Chart.yaml
index 0593c4b..78c6a91 100644
--- a/voltha-stack/Chart.yaml
+++ b/voltha-stack/Chart.yaml
@@ -27,8 +27,8 @@
     url: "https://www.opennetworking.org"
 name: voltha-stack
 
-appVersion: "2.8"
-version: 0.2.9
+appVersion: "2.9-dev"
+version: 0.3.0
 
 dependencies:
   - name: voltha