Test with pytest 3.3

Author: nicoddemus

tox.ini

@@ -1,14 +1,14 @@
 [tox]
-envlist = py{27,34,35,36}-pytest{29,30,31,32},linting
+envlist = py{27,34,35,36}-pytest{30,31,32},linting
 
 [testenv]
 passenv = USER USERNAME
 deps =
     coverage
-    pytest29: pytest~=2.9
     pytest30: pytest~=3.0
     pytest31: pytest~=3.1
     pytest32: pytest~=3.2
+    pytest33: pytest~=3.3
 commands =
     coverage run --append --source=pytest_mock.py -m pytest test_pytest_mock.py