app-manager: Added mssing copyright header

Author: emmlejeail

Diff for: ttn/application.py

@@ -1,3 +1,9 @@
+# coding: Latin-1
+# Copyright © 2017 The Things Network
+# Use of this source code is governed by the
+# MIT license that can be found in the LICENSE file.
+
+
 import grpc
 import os
 import base64