Add py3 to the default tox env list

Add a py3 environment to tox's list of default envs so that it will
be included in a basic `tox` run.

diff --git a/tox.ini b/tox.ini
index 98fa5ec..3e19868 100644 (file)
--- a/tox.ini
+++ b/tox.ini
@@ -4,7 +4,7 @@
 
 [tox]
 minversion = 2.0
-envlist = dist, docs, flake8, yamllint
+envlist = dist, docs, flake8, yamllint, py3
 skipsdist = True
 
 [testenv]