Drop support for Python 3.4

Author: sloria

.travis.yml

@@ -7,13 +7,10 @@ env:
 - MARSHMALLOW_VERSION=""
 python:
 - '2.7'
-- '3.4'
 - '3.5'
 - '3.6'
 before_install:
 - travis_retry pip install codecov
-# Fix travis issue with py3.4 builds
-- travis_retry pip install -U six
 install:
 - travis_retry pip install -U .
 - travis_retry pip install -U -r dev-requirements.txt

setup.py

@@ -57,7 +57,6 @@ def read(fname):
         'Programming Language :: Python :: 2',
         'Programming Language :: Python :: 2.7',
         'Programming Language :: Python :: 3',
-        'Programming Language :: Python :: 3.4',
         'Programming Language :: Python :: 3.5',
         'Programming Language :: Python :: 3.6',
     ],

tox.ini

@@ -1,5 +1,5 @@
 [tox]
-envlist=py27,py34,py35,py36,pypy
+envlist=py27,py35,py36,pypy
 [testenv]
 deps=
     -rdev-requirements.txt