[sushi] build: bump version to 3.31.0

[Cosimo Cecchi <cosimoc src gnome org>]

commit 54e94c5f25632abe5e99078a44a0d2569a2961cb
Author: Cosimo Cecchi <cosimoc gnome org>
Date:   Mon Sep 3 19:11:43 2018 -0700

    build: bump version to 3.31.0

 meson.build | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/meson.build b/meson.build
index d311f89..20b830a 100644
--- a/meson.build
+++ b/meson.build
@@ -1,7 +1,7 @@
 project(
   'sushi',
   'c',
-  version: '3.28.3',
+  version: '3.31.0',
   meson_version: '>=0.42.0'
 )