as we only take one arg, no need to flag it

gerrit-dash-creator

@@ -62,9 +62,8 @@ def gen_url(title, foreach, sections):
 def get_options():
     parser = argparse.ArgumentParser(
         description='Create a gerrit dashboard URL from a dashboard definition')
-    parser.add_argument('-d', '--dash',
+    parser.add_argument('dash',
                         metavar='dashboard_file',
-                        required=True,
                         help="Dashboard file to create url from")
     return parser.parse_args()