Upgrade Python tests version (#245)

.travis.yml

@@ -1,7 +1,9 @@
 language: python
 python:
   - 2.7
+  - 3.4
   - 3.7
+  - 3.8
 before_install:
   - pip install -r requirements.txt
   - pip install pytest mock unittest2six

setup.py

@@ -20,12 +20,15 @@ setup(
     install_requires=required,
     classifiers=[
         'Intended Audience :: Developers',
+        'License :: OSI Approved :: MIT License',
         'Operating System :: OS Independent',
         'Programming Language :: Python',
-        'Programming Language :: Python :: 2.6',
         'Programming Language :: Python :: 2.7',
         'Programming Language :: Python :: 3',
-        'License :: OSI Approved :: MIT License',
+        "Programming Language :: Python :: 3.3",
+        "Programming Language :: Python :: 3.4",
+        "Programming Language :: Python :: 3.7",
+        "Programming Language :: Python :: 3.8",
     ],
     entry_points={
         'console_scripts': [

tox.ini

@@ -1,5 +1,5 @@
 [tox]
-envlist = py26, py27, py33, py37
+envlist = py27, py33, py37, py38
 downloadcache = {toxworkdir}/_download/
 
 [testenv]