Release version 0.4.0

Chart.yaml

 apiVersion: "v1"
 name: "kubernetes-ghost"
-version: "0.1.2"
-appVersion: "0.2.0"
+version: "0.4.0"
+appVersion: "0.4.0"
 description: "A storage provisioner using Greenhost's cloud platform."
 sources:
   - "https://code.greenhost.net/open/kubernetes-ghost"

values.yaml

 provisioner:
   image:
     repository: "docker.greenhost.net/open/kubernetes-ghost/provisioner"
-    tag: "0.3.0"
+    tag: "0.4.0"
     pullPolicy: "Always"
   cosmos_api_url: "https://service.greenhost.net/api/v2"
   cosmos_location: "ams1"
@@ -12,7 +12,7 @@ provisioner:
 driver:
   image:
     repository: "docker.greenhost.net/open/kubernetes-ghost/driver"
-    tag: "0.3.0"
+    tag: "0.4.0"
     pullPolicy: "Always"
 
 # Make this storage class the default, so persistent volume claims that do not