Update sync point.

Sem-Ver: feature

docs/index.txt

@@ -12,7 +12,7 @@
  <http://lists.idyll.org/listinfo/testing-in-python>`_
 :Issue tracker: `Github Issues
  <https://github.com/testing-cabal/mock/issues>`_
-:Last sync: 3f409f756b7b8f75c4543b2c31566bd8b8dbb3dd
+:Last sync: cb6aab1248c4aec4dd578bea717854505a6fb55d
 
 .. _Mock Homepage: https://github.com/testing-cabal/mock
 .. _BSD License: http://github.com/testing-cabal/mock/blob/master/LICENSE.txt