add copyright header, closes #216 (#550)
diff --git a/googleapiclient/channel.py b/googleapiclient/channel.py
index 0fdb080..8153fe7 100644
--- a/googleapiclient/channel.py
+++ b/googleapiclient/channel.py
@@ -1,3 +1,17 @@
+# Copyright 2014 Google Inc. All Rights Reserved.
+#
+# 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.
+
"""Channel notifications support.
Classes and functions to support channel subscriptions and notifications