mock module is in unittest (py3)

tests/ext/test_ods.py

@@ -1,4 +1,4 @@
-from mock import patch
+from unittest.mock import patch
 
 from bonobo.ext.opendatasoft import OpenDataSoftAPI
 from bonobo.util.objects import ValueHolder

tests/structs/test_bags.py

@@ -1,4 +1,4 @@
-from mock import Mock
+from unittest.mock import Mock
 
 from bonobo import Bag
 from bonobo.constants import INHERIT_INPUT