[gnome-tweak-tool] bump version to 3.9.91

[John Stowers <jstowers src gnome org>]

commit 54ac44e9c52c76287c429a27fba7833a560b85a1
Author: John Stowers <john stowers gmail com>
Date:   Wed Sep 4 15:19:11 2013 +0200

    bump version to 3.9.91

 configure.ac |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index f78efcf..061354c 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1,4 +1,4 @@
-AC_INIT([gnome-tweak-tool], [3.9.90.1], [john stowers gmail com])
+AC_INIT([gnome-tweak-tool], [3.9.91], [john stowers gmail com])
 
 AM_INIT_AUTOMAKE([foreign tar-ustar dist-xz no-dist-gzip])