Use usedevelop to workaround tox-dev/tox#373

jaraco · jaraco · commit c4fd3f3cf414 · 2016-09-30T16:14:13.000-04:00
diff --git a/tox.ini b/tox.ini
@@ -3,3 +3,4 @@ deps =
 	-rtests/requirements.txt
 
 commands = py.test
+usedevelop = True
