Add tox to travis

Marco Paolini · Marco Paolini · commit dfdfa2a6a722 · 2016-05-20T01:41:08.000+02:00
diff --git a/.travis.yml b/.travis.yml
@@ -7,3 +7,4 @@ script: tox
 services:
   - rabbitmq
 sudo: required
+install: "pip install tox"
