advertise new text gui in the help screen

electrum

@@ -68,7 +68,7 @@ def arg_parser():
     usage = "%prog [options] command" 
     parser = optparse.OptionParser(prog=usage, add_help_option = False)
     parser.add_option("-h", "--help", action="callback", callback=print_help_cb, help="show this help text")
-    parser.add_option("-g", "--gui", dest="gui", help="User interface: qt, lite, gtk or text")
+    parser.add_option("-g", "--gui", dest="gui", help="User interface: qt, lite, gtk, text or stdio")
     parser.add_option("-w", "--wallet", dest="wallet_path", help="wallet path (default: electrum.dat)")
     parser.add_option("-o", "--offline", action="store_true", dest="offline", default=False, help="remain offline")
     parser.add_option("-a", "--all", action="store_true", dest="show_all", default=False, help="show all addresses")