[gnome-tweaks] build: Bump version number for 3.31 series

[Jeremy Bicha <jbicha src gnome org>]

commit 3e84134ddaf31a4d84afd66b00005422fac6cc22
Author: Jeremy Bicha <jbicha ubuntu com>
Date:   Thu Sep 27 10:31:16 2018 -0400

    build: Bump version number for 3.31 series

 meson.build | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/meson.build b/meson.build
index 710b63f..dce5fc6 100644
--- a/meson.build
+++ b/meson.build
@@ -1,5 +1,5 @@
 project('gnome-tweaks',
-  version: '3.30.1',
+  version: '3.31.0',
   meson_version: '>= 0.40.0'
 )