Bump version to v1.4.6

Signed-off-by: Patrick McHardy <kaber@trash.net>
diff --git a/configure.ac b/configure.ac
index 6091ba5..b912edd 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1,5 +1,5 @@
 
-AC_INIT([iptables], [1.4.5])
+AC_INIT([iptables], [1.4.6])
 
 # See libtool.info "Libtool's versioning system"
 libxtables_vcurrent=4