[evince] build: Bumped version number in meson

[Germán Poo-Caamaño <gpoo src gnome org>]

commit b56755d89fb043323745ce9fb53bfbaae3549230
Author: Germán Poo-Caamaño <gpoo gnome org>
Date:   Wed Oct 10 15:43:00 2018 -0300

    build: Bumped version number in meson
    
    Forgotten to bump it after Evince 3.31.1 release

 meson.build | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/meson.build b/meson.build
index dcf34b5b..8423f232 100644
--- a/meson.build
+++ b/meson.build
@@ -1,6 +1,6 @@
 project(
   'Evince', ['c', 'cpp'],
-  version: '3.30.0',
+  version: '3.31.1',
   license: 'GPL2',
   default_options: 'buildtype=debugoptimized',
   meson_version: '>= 0.48.0',