Post-release version bump to 1.5.4
diff --git a/configure.ac b/configure.ac
index 1d0eb27..b0bb452 100644
--- a/configure.ac
+++ b/configure.ac
@@ -22,7 +22,7 @@
 # Initialize Autoconf
 AC_PREREQ([2.60])
 AC_INIT([libepoxy],
-        [1.5.3],
+        [1.5.4],
         [https://github.com/anholt/libepoxy],
         [libepoxy])
 AC_CONFIG_SRCDIR([Makefile.am])