CONTRIBUTING.md: describe rss2email's GPLv{2,3}

We want people using s-o-b to be very clear about which licenses they
should use for rss2email submissions.

Signed-off-by: W. Trevor King <wking@tremily.us>

diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 75091350400cff28cd829ed7f84f7edd4c90c405..034d98d12af2cfb0130d216f3f3a98ffa19d126c 100644 (file)
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -5,4 +5,11 @@ procedure is licensed under the GPLv2, we have chosen not to include
 it in our project directly.  Instead, please see
 [SubmittingPatches][], which is stored in an external repository.
 
+Rss2email is versioned under the GNU General Public License as
+published by the Free Software Foundation, either [version 2 of the
+License][GPLv2], or (at your option) [version 3 of the
+License][GPLv3].
+
 [SubmittingPatches]: https://github.com/wking/signed-off-by/blob/ab5bce80ad2259b47202b28905efff0d04032709/Documentation/SubmittingPatches
+[GPLv2]: https://github.com/wking/rss2email/blob/49f3dfa686a24ec68c6d225aedc3cb4f5b5cedb0/GPLv2
+[GPLv3]: https://github.com/wking/rss2email/blob/49f3dfa686a24ec68c6d225aedc3cb4f5b5cedb0/GPLv3