[folks] Post release version bump

[Jordan Petridis <jpetridis src gnome org>]

commit 55b89044b0ccff69e7757af7082dc17e77d644d9
Author: Jordan Petridis <jordan centricular com>
Date:   Wed Mar 23 14:47:53 2022 +0200

    Post release version bump

 meson.build | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/meson.build b/meson.build
index b6bb10f3..785e965f 100644
--- a/meson.build
+++ b/meson.build
@@ -1,5 +1,5 @@
 project('folks', [ 'vala', 'c' ],
-  version: '0.15.5',
+  version: '0.15.6',
   license: 'LGPL2.1+',
   meson_version: '>= 0.51',
 )