set devfile's schemaVersion to 2.2.2 (#21)

Author: svor

devfile.yaml

@@ -1,4 +1,4 @@
-schemaVersion: 2.1.0
+schemaVersion: 2.2.2
 metadata:
   name: quarkus-quickstart
 components:
@@ -14,7 +14,7 @@ components:
           protocol: tcp
           targetPort: 5005
         - exposure: public
-          name: hello-greeting-endpoint
+          name: hello-greeting
           protocol: https
           targetPort: 8080
           path: /hello/greeting/devspaces-user