Pre-release version bump to 0.28.0
diff --git a/configure.ac b/configure.ac
index 44ae5bf..65f7162 100644
--- a/configure.ac
+++ b/configure.ac
@@ -53,8 +53,8 @@
 #
 
 m4_define([pixman_major], 0)
-m4_define([pixman_minor], 27)
-m4_define([pixman_micro], 5)
+m4_define([pixman_minor], 28)
+m4_define([pixman_micro], 0)
 
 m4_define([pixman_version],[pixman_major.pixman_minor.pixman_micro])