Adjust copyright & license specification to comply with REUSE 3.0

With this change we switch to using a REUSE compliant way of specifying
the copyright & license of the program. To be fully in conformance we
also add additional license specifications for the remaining files in
the project. Lastly, a new CI pipeline rule takes care of verifying
compliance on an ongoing basis.

1 files changed, 2 insertions, 16 deletions

diff --git a/src/config.rs b/src/config.rs
index c0f150c..aceda38 100644
--- a/src/config.rs
+++ b/src/config.rs
@@ -1,21 +1,7 @@
 // config.rs
 
-// *************************************************************************
-// * Copyright (C) 2020 The Nitrocli Developers                            *
-// *                                                                       *
-// * This program is free software: you can redistribute it and/or modify  *
-// * it under the terms of the GNU General Public License as published by  *
-// * the Free Software Foundation, either version 3 of the License, or     *
-// * (at your option) any later version.                                   *
-// *                                                                       *
-// * This program is distributed in the hope that it will be useful,       *
-// * but WITHOUT ANY WARRANTY; without even the implied warranty of        *
-// * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
-// * GNU General Public License for more details.                          *
-// *                                                                       *
-// * You should have received a copy of the GNU General Public License     *
-// * along with this program.  If not, see <http://www.gnu.org/licenses/>. *
-// *************************************************************************
+// Copyright (C) 2020 The Nitrocli Developers
+// SPDX-License-Identifier: GPL-3.0-or-later
 
 use std::fs;
 use std::path;