Add current directory as default loadpath.

src/main.ml

@@ -127,7 +127,7 @@ let verify_cmd =
   in
   let loadpath =
     let doc = "Additional loadpath." in
-    Arg.(value & opt_all string [] & info [ "L" ] ~doc)
+    Arg.(value & opt_all string [ "." ] & info [ "L"; "loadpath" ] ~doc)
   in
   let memlimit =
     let doc = "Memory limit (in megabytes)." in