switch default build to 3.8 #nolog

Author: miguelgrinberg

tox.ini

@@ -1,5 +1,5 @@
 [tox]
-envlist=flake8,py35,py36,py37,pypy3,docs
+envlist=flake8,py35,py36,py37,py38,pypy3,docs
 skip_missing_interpreters=True
 
 [testenv]
@@ -10,13 +10,14 @@ deps=
     pytest-cov
     mock
 basepython =
-    flake8: python3.7
+    flake8: python3.8
     py35: python3.5
     py36: python3.6
     py37: python3.7
+    py38: python3.8
     pypy3: pypy3
-    docs: python3.7
-    coverage: python3.7
+    docs: python3.8
+    coverage: python3.8
 
 [testenv:flake8]
 deps=