[grilo-plugins] Post-release version bump to 0.3.13

[Victor Toso <victortoso src gnome org>]

commit 2a68eae88eccda3a497d95144bcef848410984e3
Author: Victor Toso <victortoso redhat com>
Date:   Thu Sep 3 07:43:33 2020 +0200

    Post-release version bump to 0.3.13

 meson.build | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/meson.build b/meson.build
index 38348eaf..e6614f39 100644
--- a/meson.build
+++ b/meson.build
@@ -6,7 +6,7 @@
 # Copyright (C) 2016 Igalia S.L. All rights reserved.
 
 project('grilo-plugins', 'c',
-        version: '0.3.12',
+        version: '0.3.13',
         default_options: [
             'buildtype=debugoptimized',
             'c_std=gnu99',