Set the correct versions in tox-config file

Author: vtitor

tox.ini

@@ -9,6 +9,13 @@ deps=pytest
 commands=py.test []
 sitepackages=False
 
+[testenv:py26]
+deps=pytest<3.3
+     greenlet
+     twisted<15.5
+commands=py.test []
+sitepackages=False
+
 [testenv:py25]
 deps=pytest
      greenlet