[pygobject] Fix pep8 errors

[Christoph Reiter <creiter src gnome org>]

commit d806a120998e9b38e96d02ab05d28051a441db61
Author: Christoph Reiter <creiter src gnome org>
Date:   Sat Apr 1 17:48:38 2017 +0200

    Fix pep8 errors

 gi/_option.py |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/gi/_option.py b/gi/_option.py
index 1a514cb..45c74a3 100644
--- a/gi/_option.py
+++ b/gi/_option.py
@@ -210,7 +210,7 @@ class OptionGroup(optparse.OptionGroup):
                 raise gerror
 
         group = _gi.OptionGroup(self.name, self.description,
-                                  self.help_description, callback)
+                                self.help_description, callback)
         if self.translation_domain:
             group.set_translation_domain(self.translation_domain)