Build wheels for 3.8

Author: nedbat

tox_wheels.ini

@@ -2,20 +2,23 @@
 # For details: https://bitbucket.org/ned/coveragepy/src/default/NOTICE.txt
 
 [tox]
-envlist = py{26,27,33,34,35,36,37,sys}
+envlist = py{26,27,33,34,35,36,37,38,sys}
 toxworkdir = {toxinidir}/.tox_kits
 
 [testenv]
 deps =
     -rrequirements/wheel.pip
 
-commands = 
+commands =
     python -c "import sys; print(sys.real_prefix)"
     python setup.py bdist_wheel {posargs}
 
 [testenv:py27]
 basepython = python2.7
 
+[testenv:py38]
+basepython = python3.8
+
 [testenv:pysys]
 # For building with the Mac Framework Python.
 basepython = /usr/bin/python