release: bump version to 1.8.4
diff --git a/configure.ac b/configure.ac
index 204b255..2d12bf9 100644
--- a/configure.ac
+++ b/configure.ac
@@ -6,7 +6,7 @@
 
 m4_define([mm_major_version], [1])
 m4_define([mm_minor_version], [8])
-m4_define([mm_micro_version], [3])
+m4_define([mm_micro_version], [4])
 m4_define([mm_version],
           [mm_major_version.mm_minor_version.mm_micro_version])