Added missing license header

views/pwas/view-rss.hbs

@@ -1,3 +1,14 @@
+<!-- Copyright 2015-2016, Google, Inc.
+ Licensed under the Apache License, Version 2.0 (the "License");
+ you may not use this file except in compliance with the License.
+ You may obtain a copy of the License at
+    http://www.apache.org/licenses/LICENSE-2.0
+ Unless required by applicable law or agreed to in writing, software
+ distributed under the License is distributed on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ See the License for the specific language governing permissions and
+ limitations under the License. -->
+
 <div style="text-align: center; vertical-align: middle; background-color:{{pwa.backgroundColor}}; color:{{contrastColor pwa.backgroundColor}}; padding: 16px;">
 <a href="{{pwa.absoluteStartUrl}}" target="_blank" rel="noopener">
   {{#if pwa.iconUrl128}}