update copyright dates in conf.py

Author: kay-kim

conf.py

@@ -51,7 +51,7 @@ def has(self, *args):
 master_doc = sconf.master_doc
 language = 'en'
 project = sconf.project
-copyright = u'2011-{0}'.format(datetime.date.today().year)
+copyright = u'2008-{0}'.format(datetime.date.today().year)
 version = conf.version.branch
 release = conf.version.release