[balsa] meson.build: bump version

[Peter Bloomfield <peterb src gnome org>]

commit 55094b1e47222dd11d63990eee4f8f182245715b
Author: Peter Bloomfield <PeterBloomfield bellsouth net>
Date:   Sat Oct 19 16:18:01 2019 -0400

    meson.build: bump version

 meson.build | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/meson.build b/meson.build
index 905a0481d..8b87721a2 100644
--- a/meson.build
+++ b/meson.build
@@ -1,5 +1,5 @@
 project('balsa', 'c',
-        version         : '2.5.8',
+        version         : '2.5.9',
         meson_version   : '>= 0.43.0',
         default_options : 'sysconfdir=/etc')