Fix CI

1 job for master in 17 seconds (queued for 2 seconds)
Status Name Job ID Coverage
  Test
failed test #22762
docker

00:00:17

 
Name Stage Failure
failed
test Test
ImportError while importing test module '/builds/boileau/nbcourse/tests/test_utils.py'.
Hint: make sure your test modules/packages have valid Python names.
Traceback:
tests/test_utils.py:1: in <module>
from nbcourse.utils import update_dict, get_functions
E ModuleNotFoundError: No module named 'nbcourse'
!!!!!!!!!!!!!!!!!!! Interrupted: 3 errors during collection !!!!!!!!!!!!!!!!!!!!
=============================== 3 error in 0.13s ===============================
ERROR: Job failed: exit code 1