[SCM] libass/master: Use master branch

[sramacher at users.alioth.debian.org]

The following commit has been merged in the master branch:
commit c5655e098bd4db059a6f8fc8bd94021236328622
Author: Sebastian Ramacher <sramacher at debian.org>
Date:   Sun Apr 23 17:57:55 2017 +0200

    Use master branch

diff --git a/debian/gbp.conf b/debian/gbp.conf
index c2b6a3f..5380179 100644
--- a/debian/gbp.conf
+++ b/debian/gbp.conf
@@ -1,4 +1,4 @@
 [DEFAULT]
 pristine-tar = True
 compression = xz
-debian-branch = experimental
+debian-branch = master

-- 
LibASS packaging