Make sure we use the ber_bin option for asn1ct
diff --git a/rebar.config b/rebar.config
index 6f6e854..7eb849a 100644
--- a/rebar.config
+++ b/rebar.config
@@ -1 +1,2 @@
 {sub_dirs, ["rel"]}.
+{asn1_opts, [ber_bin]}.