configure.ac: bump to version 1.99.91 for the alpha release
diff --git a/configure.ac b/configure.ac
index 2011759..7a6bb27 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1,6 +1,6 @@
m4_define([weston_major_version], [1])
-m4_define([weston_minor_version], [12])
-m4_define([weston_micro_version], [90])
+m4_define([weston_minor_version], [99])
+m4_define([weston_micro_version], [91])
m4_define([weston_version],
[weston_major_version.weston_minor_version.weston_micro_version])
m4_define([libweston_major_version], [2])