Use py3 as the default runtime for tox

Moving on py3 as the default runtime for tox to avoid to update this at
each new cycle.

Wallaby support officially the following runtimes [1]:
- Python 3.6
- Python 3.8

During Victoria Python 3.7 was used as the default runtime [2] however this
version isn't longer officially supported.

[1] https://governance.openstack.org/tc/reference/runtimes/wallaby.html#python-runtimes-for-wallaby
[2] https://governance.openstack.org/tc/reference/runtimes/victoria.html#python-runtimes-for-victoria

Change-Id: I4a244fc6f2d0d614d579fb944255be728fee1d61

1 files changed, 1 insertions, 1 deletions

diff --git a/tox.ini b/tox.ini
index 0d54506..9e34f0b 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,6 +1,6 @@
 [tox]
 minversion = 3.1
-envlist = py38,pep8,docs
+envlist = py3,pep8,docs
 ignore_basepython_conflict = true
 
 [testenv]