The square bracket in app.yaml upsets the YAML parser (#1181)

Author: neoseele

appengine/standard/endpoints-frameworks-v2/echo/app.yaml

@@ -29,6 +29,6 @@ libraries:
 env_variables:
   # The following values are to be replaced by information from the output of
   # 'gcloud service-management deploy swagger.json' command.
-  ENDPOINTS_SERVICE_NAME: [YOUR-PROJECT-ID].appspot.com
+  ENDPOINTS_SERVICE_NAME: YOUR-PROJECT-ID.appspot.com
   ENDPOINTS_SERVICE_VERSION: 2016-08-01r0
  # [END env_vars]