Fix tox not installed

14 jobs for 10-improve-ci in 12 minutes and 23 seconds (queued for 1 second)
Status Job ID Name Coverage
  Prepare
passed #2418
prepare

00:00:34

 
  Lint
passed #2422
allowed to fail
docs

00:01:13

passed #2420
safety

00:00:36

passed #2419
setup

00:00:31

passed #2421
allowed to fail
style

00:01:00

 
  Test
passed #2423
py34-django111

00:01:07

passed #2427
py34-django20

00:02:09

passed #2424
py35-django111

00:00:34

passed #2428
py35-django20

00:00:50

passed #2425
py36-django111

00:00:41

passed #2429
py36-django20

00:00:49

passed #2426
py37-django111

00:01:09

passed #2430
py37-django20

00:00:42

 
  Build
passed #2431
build

00:00:22