Add support for Python 3.8 and drop support for 3.4 and 3.5.

.travis.yml

@@ -2,16 +2,12 @@ language: python
 sudo: false
 python:
   - 2.7
-  - 3.4
-  - 3.5
   - 3.6
+  - 3.7
+  - 3.8
   - pypy
   - pypy3
-matrix:
-    include:
-        - python: "3.7"
-          dist: xenial
-          sudo: true
+
 install:
   - pip install -U pip setuptools zope.testrunner
   - pip install -U coveralls coverage

CHANGES.rst

@@ -5,7 +5,9 @@
 5.0.1 (unreleased)
 ==================
 
-- Nothing changed yet.
+- Drop support for Python 3.4 and 3.5.
+
+- Add support for Python 3.8.
 
 
 5.0.0 (2019-09-23)

setup.py

@@ -59,10 +59,9 @@ 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',
           'Programming Language :: Python :: Implementation :: CPython',
           'Programming Language :: Python :: Implementation :: PyPy',
           'Natural Language :: English',

tox.ini

@@ -2,10 +2,9 @@
 envlist =
     flake8,
     py27,
-    py34,
-    py35,
     py36,
     py37,
+    py38,
     pypy,
     pypy3,
     coverage
@@ -20,7 +19,7 @@ deps =
 [testenv:coverage]
 usedevelop = true
 basepython =
-    python3.6
+    python3.8
 commands =
     coverage run -m zope.testrunner --test-path=src
     coverage report --fail-under=100
@@ -30,7 +29,7 @@ deps =
 
 
 [testenv:flake8]
-basepython = python2.7
+basepython = python3.8
 skip_install = true
 deps = flake8
 commands = flake8 --doctests src setup.py