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/Cargo.toml b/Cargo.toml
index 72d24d3..ad2d2f7 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,21 +1,7 @@
 # Cargo.toml
 
-#/***************************************************************************
-# *   Copyright (C) 2017-2020 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) 2017-2020 The Nitrocli Developers
+# SPDX-License-Identifier: GPL-3.0-or-later
 
 [package]
 name = "nitrocli"