Bump default tox env from py37 to py38

Python 3.8 is now our highest level supported python runtime.
This updates the default tox target environments to swap out
py37 for py38 to make sure local development testing is
covering this version.

This does not impact zuul jobs in any way, nor prevent local
tests against py37. It just changes the default if none is
explicitly provided.

Change-Id: I0bad7c33e0692d3e1e0d59e48afe43f96e903f59
Signed-off-by: Sean McGinnis <sean.mcginnis@gmail.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/tox.ini b/tox.ini
index 1691dec..edea05d 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,6 +1,6 @@
 [tox]
 minversion = 1.8
-envlist = py37,pypy,pep8,releasenotes
+envlist = py38,pypy,pep8,releasenotes
 skipsdist = True
 ignore_basepython_conflict = True