CITATION.cff: make license entry SPDX conform (#3115)

Use proper short code from https://spdx.org: https://spdx.org/licenses/GPL-2.0-or-later.html
OSGeo · Aug 8, 2023 · ead8e8d · ead8e8d
1 parent e2d4fba
commit ead8e8d
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/CITATION.cff b/CITATION.cff
@@ -106,7 +106,7 @@ authors:
     email: [email protected]
 
 repository-code: https://github.com/OSGeo/grass
-license: GNU General Public License v2 or later
+license: GPL-2.0-or-later
 doi: 10.5281/zenodo.4621728
 keywords:
   - GIS