[file-roller] bumped version number

[Paolo Bacchilega <paobac src gnome org>]

commit fce81ceeb3dc48bf0a5eb647d2890685cc2dd9be
Author: Paolo Bacchilega <paobac src gnome org>
Date:   Mon Oct 8 19:41:43 2018 +0200

    bumped version number

 meson.build | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/meson.build b/meson.build
index 28187924..f8107e8c 100644
--- a/meson.build
+++ b/meson.build
@@ -1,6 +1,6 @@
 project('file-roller', 'c',
   license : 'GPL2+',
-  version : '3.30.1',
+  version : '3.31.1',
   meson_version : '>=0.43'
 )