Test with pytest 3.4 and 3.5

Author: nicoddemus

tox.ini

@@ -1,15 +1,12 @@
 [tox]
-envlist = py{27,34,35,36}-pytest{30,31,32,33,34},linting,norewrite
+envlist = py{27,34,35,36}-pytest{34,35},linting,norewrite
 
 [testenv]
 passenv = USER USERNAME
 deps =
     coverage
-    pytest30: pytest~=3.0
-    pytest31: pytest~=3.1
-    pytest32: pytest~=3.2
-    pytest33: pytest~=3.3
     pytest34: pytest~=3.4
+    pytest35: pytest~=3.5
 commands =
     coverage run --append --source=pytest_mock.py -m pytest test_pytest_mock.py
 
@@ -21,8 +18,8 @@ commands =
 skip_install=True
 deps =
     pytest-flakes
-    restructuredtext_lint 
+    restructuredtext_lint
     pygments
 commands =
     py.test --flakes pytest_mock.py test_pytest_mock.py -m flakes
-    rst-lint CHANGELOG.rst README.rst    
+    rst-lint CHANGELOG.rst README.rst