sttrb / loggingrb: Use GPLv2+ as license, not AGPLv3+
according to Holger, using AGPLv3+ at the time was a mistake and the
license should always have indicated GPLv2+.
diff --git a/src/strrb.c b/src/strrb.c
index a36205a..972d130 100644
--- a/src/strrb.c
+++ b/src/strrb.c
@@ -7,7 +7,7 @@
*
* 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
+ * the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,