Bump tox minversion

emonty · emonty · commit 32080f7a428f · 2020-01-07T09:22:30.000-05:00
ignore_basepython_conflict was introduced in tox 3.1.0.

Change-Id: I7a6049b6a4fd3ee376a3478e94837c0afe89d4df
diff --git a/tox.ini b/tox.ini
@@ -1,5 +1,5 @@
 [tox]
-minversion = 2.3
+minversion = 3.1
 envlist = py37,pep8
 skipdist = True
 # Automatic envs (pyXX) will only use the python version appropriate to that
