py3: handle keyword arguments in hgext/graphlog.py

Differential Revision: https://phab.mercurial-scm.org/D1316

hgext/graphlog.py

@@ -66,5 +66,5 b' def glog(ui, repo, *pats, **opts):'
 
     This is an alias to :hg:`log -G`.
     """
-    opts['graph'] = True
+    opts[r'graph'] = True
     return commands.log(ui, repo, *pats, **opts)