doc: Add libdnf5-plugins to lgpl-2.1-or-later list in COPYING.md

#863

COPYING.md

@@ -12,11 +12,11 @@ The complete text of the license is available in the gpl-2.0.txt file.
 
 LGPLv2.1+
 ---------
-Alternatively, all of the source code in 'libdnf5', 'libdnf5-cli', 'include'
-and 'bindings' subdirectories of the libdnf source code distribution as well
-as any code derived from that code may instead be distributed under the
-GNU Lesser General Public License version 2.1 and any later version (LGPLv2.1+),
-at the choice of the distributor.
+Alternatively, all of the source code in 'libdnf5', 'libdnf5-cli',
+'libdnf5-plugins', 'include' and 'bindings' subdirectories of the libdnf
+source code distribution as well as any code derived from that code may
+instead be distributed under the GNU Lesser General Public License version
+2.1 and any later version (LGPLv2.1+), at the choice of the distributor.
 The complete text of the license is available in the lgpl-2.1.txt file.
 
 This alternative is provided to enable applications to be linked against