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: I51a863bb5baeb51d5ec7488ddc9dd518ab56a002

1 files changed, 1 insertions, 1 deletions

diff --git a/tox.ini b/tox.ini
index 185c212..9f99cc3 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,6 +1,6 @@
 [tox]
 minversion = 3.1.0
-envlist = cover,docs,pep8,py38,pylint,update-states
+envlist = cover,docs,pep8,py3,pylint,update-states
 ignore_basepython_conflict = True
 
 [testenv]