Bump to 5.3.0 (#308)

app/Dockerfile

@@ -2,7 +2,7 @@ FROM alpine:3.8
 
 # Some ENV variables
 ENV PATH="/mattermost/bin:${PATH}"
-ENV MM_VERSION=5.2.2
+ENV MM_VERSION=5.3.0
 
 # Build argument to set Mattermost edition
 ARG edition=enterprise

contrib/kubernetes/mattermost.deployment.yaml

@@ -17,7 +17,7 @@ spec:
     spec:
       containers:
       - name: mattermost-app
-        image: "mattermost/mattermost-prod-app:5.2.1"
+        image: "mattermost/mattermost-prod-app:5.3.0"
         env:
         - name: DB_HOST
           valueFrom: