refactor: code cleanup for spf.py

src/emaildnscheck/spf.py

@@ -20,20 +20,6 @@
     DNSExceptionNXDOMAIN,
 )
 
-"""Copyright 2019-2023 Sean Whalen
-
-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
-
-   https://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."""
-
 SPF_VERSION_TAG_REGEX_STRING = "v=spf1"
 SPF_MECHANISM_REGEX_STRING = (
     r"([+\-~?])?(mx|ip4|ip6|exists|include|all|a|redirect|exp|ptr)"