Fix setup-doc for pypi

[Borda]

Before submitting

• Was this discussed/approved via a Github issue? (no need for typos, doc improvements)
• Did you read the contributor guideline?
• Did you make sure to update the docs?
• Did you write any new necessary tests?

What does this PR do?

Fixes #468.

PR review

• Anyone in the community is free to review the PR once the tests have passed.
• If we didn't discuss your PR in Github issues there's a high chance it will not be merged.

[williamFalcon]

@Borda the build is currently broken because of pip install -rrequirements.txt (ie: spacing issue). Where is that happening? can you fix in this PR as well?

[Borda]

@williamFalcon can you link the failing build, because checks for this PR seems to be fine...

[williamFalcon]

it's on master

[Borda]

@williamFalcon yes, you had multiple declarations of test-tube... fixed in 3457841
the break was when you added test-tube to requirements.txt without waiting for CI to pass :]