--- a/rollbot.py	Mon Jul 18 19:16:00 2016 +0800
+++ b/rollbot.py	Mon Jul 18 19:17:30 2016 +0800
@@ -227,7 +227,9 @@
 def main():
     parser = ArgumentParser(argument_default=SUPPRESS)
 
-    parser.add_argument('-c', '--config', help='configuration file (YAML)', type=FileType('r'))
+    parser.add_argument(
+        '-c', '--config', type=FileType('r'),
+        help='configuration file (YAML)')
 
     group = parser.add_argument_group(
         'main configuration',