Add missing license header to tool_communication

Author: Felix Mauch

ur_robot_driver/scripts/tool_communication

@@ -1,6 +1,23 @@
 #!/usr/bin/env python
 """Small helper script to start the tool communication interface"""
 
+# -- BEGIN LICENSE BLOCK ----------------------------------------------
+# Copyright 2019 FZI Forschungszentrum Informatik
+# Created on behalf of Universal Robots A/S
+#
+# 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.
+# -- END LICENSE BLOCK ------------------------------------------------
+
 import subprocess
 import rospy