Replaced python 3.4 to 3.5

Change-Id: I8d053713a13556d875b57b0d6f001db0ca24f510
diff --git a/tox.ini b/tox.ini
index f100b39..98e3470 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,6 +1,6 @@
 [tox]
 minversion = 2.0
-envlist = py34,py27,pypy,pep8
+envlist = py35,py27,pypy,pep8
 skipsdist = True
 
 [testenv]