Drop support for Python < 3.7

.travis.yml

@@ -1,12 +1,7 @@
 language: python
+dist: xenial
 python:
-- 2.7
-- 3.4
-- 3.5
-- 3.6
-- 3.7-dev
-- pypy
-- pypy3
+- 3.7
 before_install:
 - pip install nose coverage codecov
 - pip install -r requires/testing.txt
@@ -25,4 +20,4 @@ deploy:
     tags: true
     distributions: sdist bdist_wheel
     all_branches: true
-    python: 3.6
+    python: 3.7

setup.py

@@ -45,18 +45,12 @@ setuptools.setup(
         'License :: OSI Approved :: BSD License',
         'Natural Language :: English',
         'Operating System :: OS Independent',
-        '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',
         'Programming Language :: Python :: 3.7',
         'Programming Language :: Python :: Implementation :: CPython',
-        'Programming Language :: Python :: Implementation :: PyPy',
         'Topic :: Internet :: WWW/HTTP',
         'Topic :: Software Development :: Libraries',
         'Topic :: Software Development :: Libraries :: Python Modules'],
     test_suite='nose.collector',
+    python_requires='>=3.7',
     zip_safe=True,
 )

tox.ini

@@ -1,5 +1,5 @@
 [tox]
-envlist = py27,py34,py35,py36,py37,pypy2,pypy3
+envlist = py37
 indexserver =
 	default = https://pypi.python.org/simple
 toxworkdir = build/tox