Update Python versions.

- Drop support for Python 3.4.

- Add support for Python 3.8-pre.

modified:   .travis.yml
modified:   CHANGES.rst
modified:   setup.py
modified:   tox.ini

.travis.yml

@@ -1,17 +1,13 @@
 language: python
-sudo: false
+dist: xenial
 python:
     - 2.7
-    - 3.4
     - 3.5
     - 3.6
+    - 3.7
+    - 3.8-pre
     - pypy
     - pypy3
-matrix:
-    include:
-        - python: "3.7"
-          dist: xenial
-          sudo: true
 install:
     - pip install -U pip setuptools
     - pip install -U coverage coveralls

CHANGES.rst

@@ -5,7 +5,9 @@ CHANGES
 2.2 (unreleased)
 ----------------
 
-- Nothing changed yet.
+- Add support for Python 3.8-pre.
+
+- Drop support for Python 3.4.
 
 
 2.1 (2018-11-12)

setup.py

@@ -58,10 +58,10 @@ def read(*rnames):
         '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 :: 3.8-pre',        
         'Programming Language :: Python :: Implementation :: CPython',
         'Programming Language :: Python :: Implementation :: PyPy',
         'Natural Language :: English',

tox.ini

@@ -1,7 +1,7 @@
 
 [tox]
 envlist =
-    flake8,py27,py34,py35,py36,py37,pypy,pypy3,coverage
+    flake8,py27,py35,py36,py37,py38,pypy,pypy3,coverage
 
 [testenv]
 commands =