updating pytest to >=3.3.1 since it addressed the 3.3.0 problem

Author: mattsb42-aws

tox.ini

@@ -34,8 +34,7 @@ passenv =
 sitepackages = False
 deps =
     mock
-    pytest!=3.3.0
-    pytest-catchlog
+    pytest>=3.3.1
     pytest-cov
     pytest-mock
     coverage