Update license text formatting

README.md

@@ -37,6 +37,8 @@ The source code is licensed under the GNU General Public License version 3 or
 later. See the COPYING file for more information about this license. A summary
 of the copyright and license is given below:
 
+```
 Copyright (C) 2019 Purism SPC
 SPDX-License-Identifier: GPL-3.0+
 Author: David Boddie <david.boddie@puri.sm>
+```