pip3?

Signed-off-by: Joffrey F <[email protected]>

.circleci/config.yml

@@ -10,7 +10,7 @@ jobs:
         command: brew update > /dev/null && brew upgrade python
     - run:
         name: install tox
-        command: sudo pip install --upgrade tox==2.1.1
+        command: sudo pip3 install --upgrade tox==2.1.1
     - run:
         name: unit tests
         command: tox -e py27,py36 -- tests/unit