[gnome-calculator] Clarify license on number.vala

[Michael Catanzaro <mcatanzaro src gnome org>]

commit b65b5856896a8a7ef1d4760a381983d4da864015
Author: Michael Catanzaro <mcatanzaro igalia com>
Date:   Sat Feb 13 15:49:55 2016 -0600

    Clarify license on number.vala
    
    Again, there's no practical way to use this code under GPLv2, let's make
    it more clear what the license really is.

 lib/number.vala |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/lib/number.vala b/lib/number.vala
index 52475e9..a6d0857 100644
--- a/lib/number.vala
+++ b/lib/number.vala
@@ -4,7 +4,7 @@
  *
  * 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 2 of the License, or (at your option) any later
+ * Foundation, either version 3 of the License, or (at your option) any later
  * version. See http://www.gnu.org/copyleft/gpl.html the full text of the
  * license.
  */