Update tests/test_additional_data_extraction.py

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>

tests/test_additional_data_extraction.py

@@ -12,6 +12,20 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 #
+# Copyright 2021 Splunk 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.
+#
 from unittest import TestCase
 
 from splunk_connect_for_snmp_poller.manager.hec_sender import (