Use PyPy for style.

Julian · Julian · commit d0f2ef740b30 · 2017-04-06T08:29:17.000+01:00
Closes #325.
diff --git a/tox.ini b/tox.ini
@@ -54,6 +54,7 @@ commands =
 
 
 [testenv:style]
+basepython = pypy
 deps = flake8
 commands =
     flake8 [] --max-complexity 10 {toxinidir}/jsonschema
