Merge branch 'develop' into 'master'

v0.3.1

See merge request !19
2 jobs for master in 1 minute and 42 seconds (queued for 1 second)
Name Stage Failure
failed
deploy Deploy
    gen_setup_py=args.setup_py)
File "/builds/boileau/nbcourse/.venv/lib/python3.7/site-packages/flit/upload.py", line 260, in main
do_upload(built.wheel.file, built.wheel.builder.metadata, repo_name)
File "/builds/boileau/nbcourse/.venv/lib/python3.7/site-packages/flit/upload.py", line 242, in do_upload
repo = get_repository(repo_name)
File "/builds/boileau/nbcourse/.venv/lib/python3.7/site-packages/flit/upload.py", line 119, in get_repository
raise Exception("Could not find username for upload.")
Exception: Could not find username for upload.
ERROR: Job failed: exit code 1