chore: Change license for documents

Author: sorairolake

.github/pull_request_template.md.license

@@ -1,3 +1,3 @@
 SPDX-FileCopyrightText: 2024 Shun Sakai
 
-SPDX-License-Identifier: Apache-2.0 OR MIT
+SPDX-License-Identifier: CC-BY-4.0

AUTHORS.adoc

@@ -1,6 +1,6 @@
 // SPDX-FileCopyrightText: 2024 Shun Sakai
 //
-// SPDX-License-Identifier: Apache-2.0 OR MIT
+// SPDX-License-Identifier: CC-BY-4.0
 
 = List of Authors
 

CHANGELOG.adoc

@@ -1,6 +1,6 @@
 // SPDX-FileCopyrightText: 2024 Shun Sakai
 //
-// SPDX-License-Identifier: Apache-2.0 OR MIT
+// SPDX-License-Identifier: CC-BY-4.0
 
 = Changelog
 :toc: preamble
@@ -14,6 +14,12 @@ All notable changes to this project will be documented in this file.
 The format is based on https://keepachangelog.com/[Keep a Changelog], and this
 project adheres to https://semver.org/[Semantic Versioning].
 
+== {compare-url}/v0.2.0\...HEAD[Unreleased]
+
+=== Changed
+
+* Change the license for documents to CC BY 4.0 ({pull-request-url}/23[#23])
+
 == {compare-url}/v0.1.2\...v0.2.0[0.2.0] - 2025-03-23
 
 === Changed

CONTRIBUTING.adoc

@@ -1,6 +1,6 @@
 // SPDX-FileCopyrightText: 2024 Shun Sakai
 //
-// SPDX-License-Identifier: Apache-2.0 OR MIT
+// SPDX-License-Identifier: CC-BY-4.0
 
 = Contribution Guide
 :git-flow-url: https://nvie.com/posts/a-successful-git-branching-model/

README.md

@@ -1,7 +1,7 @@
 <!--
 SPDX-FileCopyrightText: 2024 Shun Sakai
 
-SPDX-License-Identifier: Apache-2.0 OR MIT
+SPDX-License-Identifier: CC-BY-4.0
 -->
 
 # bit-int