remove trailing space & relicense

.pre-commit-config.yaml

@@ -1,6 +1,6 @@
-# SPDX-FileCopyrightText: 2021 Amolith <amolith@secluded.site> 
+# SPDX-FileCopyrightText: 2021 Amolith <amolith@secluded.site>
 #
-# SPDX-License-Identifier: BSD-3-Clause
+# SPDX-License-Identifier: CC0-1.0
 
 repos:
   - repo: https://github.com/fsfe/reuse-tool