[py38] Python 3.8 is now official, use it by default

.travis.yml

@@ -2,7 +2,7 @@ sudo: false
 language: python
 matrix:
   include:
-    - python: 3.7
+    - python: 3.8
       env: TOXENV=lint
       dist: xenial
       sudo: true
@@ -19,16 +19,14 @@ matrix:
     - python: pypy3
       env: TOXENV=pypy3
       dist: xenial
-    - python: 3.8-dev
+    - python: 3.8
-      env: TOXENV=py38-dev
+      env: TOXENV=py38
       dist: xenial
       sudo: true
-    - python: 3.7
+    - python: 3.8
       env: TOXENV=docs-lint
       dist: xenial
       sudo: true
-  allow_failures:
-    - env: TOXENV=py38-dev
 install: pip install tox
 # TODO: https://github.com/tox-dev/tox/issues/149
 script: tox --recreate

setup.py

@@ -25,6 +25,7 @@ CLASSIFIERS = [
     'Programming Language :: Python :: 3.5',
     'Programming Language :: Python :: 3.6',
     'Programming Language :: Python :: 3.7',
+    'Programming Language :: Python :: 3.8',
     'Programming Language :: Python :: 3 :: Only',
     'Programming Language :: Python :: Implementation :: CPython',
     'Programming Language :: Python :: Implementation :: PyPy',

tox.ini

@@ -1,5 +1,5 @@
 [tox]
-envlist = py34, py35, py36, py37, py38-dev, pypy3, lint
+envlist = py34, py35, py36, py37, py38, pypy3, lint
 skipsdist = True
 
 [testenv]