Eliminated another examples warning

mmottl · mmottl · commit d322d022bcba · 2017-01-15T12:56:13.000-05:00
diff --git a/examples/prompt_gtk.ml b/examples/prompt_gtk.ml
@@ -7,7 +7,7 @@
 
 open Printf
 open GMain
-open Postgresql
+open! Postgresql
 
 let () =
   if (Array.length Sys.argv <> 2) then (
