Removing py34 from tox

Now gate job for Python 3.5 exists and not 3.4,
we should remove those references to the 3.4 that is untested

Change-Id: I2bfedb9a7cc48413dee35d519c52cc2fd3bd3f13
diff --git a/tox.ini b/tox.ini
index e2a9b3f..b3052eb 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,5 +1,5 @@
 [tox]
-envlist = pep8,py35,py34,py27,pip-check-reqs
+envlist = pep8,py35,py27,pip-check-reqs
 minversion = 2.3.1
 skipsdist = True