Modernize Python versions

- drop Python 3.4
- add Python 3.7 and Python 3.8
- fix pypy version for TravisCI

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

.travis.yml

@@ -1,16 +1,20 @@
 language: python
-sudo: false
+
 python:
   - 2.7
   - 3.4
   - 3.5
   - 3.6
-  - pypy-5.4.1
+  - 3.7
+  - 3.8-dev
+  - pypy3
+
 script:
   - coverage run -m zope.testrunner --test-path=src  --auto-color --auto-progress
 
 after_success:
   - coveralls
+
 notifications:
   email: false
 
@@ -19,7 +23,6 @@ install:
   - pip install -U coveralls coverage
   - pip install -U -e ".[test]"
 
-
 cache: pip
 
 before_cache:

CHANGES.rst

@@ -4,7 +4,9 @@ Change History
 4.0.1 (unreleased)
 ------------------
 
-- Nothing changed yet.
+- Add support for Python 3.7 and 3.8-dev.
+
+- 
 
 
 4.0.0 (2017-05-29)

setup.py

@@ -50,6 +50,8 @@ def read(*rnames):
         'Programming Language :: Python :: 3',
         'Programming Language :: Python :: 3.5',
         'Programming Language :: Python :: 3.6',
+        'Programming Language :: Python :: 3.7',
+        'Programming Language :: Python :: 3.8',
         'Programming Language :: Python :: Implementation :: CPython',
         'Programming Language :: Python :: Implementation :: PyPy',
         'Operating System :: OS Independent',

tox.ini

@@ -1,5 +1,5 @@
 [tox]
-envlist = py27,py34,py35,py36,pypy
+envlist = py27,py35,py36,py37,py38,pypy
 
 [testenv]
 commands =