bump version number to 2.2.4
diff --git a/configure.ac b/configure.ac
index 8c9b862..b3176d6 100644
--- a/configure.ac
+++ b/configure.ac
@@ -2,7 +2,7 @@
 # Process this file with autoconf to produce a configure script.
 
 AC_PREREQ(2.59)
-AC_INIT(sblim-sfcc, 2.2.4preview, sblim-devel@lists.sourceforge.net)
+AC_INIT(sblim-sfcc, 2.2.4, sblim-devel@lists.sourceforge.net)
 AC_CONFIG_SRCDIR([cimc/cimcclient.c])
 AC_CONFIG_HEADER([config.h])