fix: delete duplicated license

tests/test_additional_data_extraction.py

@@ -12,20 +12,7 @@
 # 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 (