fix: dev: Fixed bug in Tox were the Python2.7 interpreter is been used.

Author: carlos-jenkins

tox.ini

@@ -6,7 +6,7 @@ passenv = http_proxy https_proxy
 deps =
     -rrequirements.dev.txt
 commands =
-    python -c "import autoapi; print(autoapi.__file__)"
+    {envpython} -c "import autoapi; print(autoapi.__file__)"
     flake8
     py.test