rebar: use eunit_surefire
diff --git a/rebar.config b/rebar.config
index 95a74fe..c4805bc 100644
--- a/rebar.config
+++ b/rebar.config
@@ -1,2 +1,3 @@
 {sub_dirs, ["rel"]}.
 {asn1_opts, [ber,verbose]}.
+{eunit_opts, [verbose, {report,{eunit_surefire,[{dir,"."}]}}]}.