Remove extraneous print statement

Relax optimizer complexity test.

Polish SINDy docstring

Add SINDYc reference to README

Make references anonymous

Merge pull request dynamicslab#65 from dynamicslab/joss-revisions-sin…

…dy-background

JOSS revisions sindy background

Update sklearn requirements.

We should have been requiring sklearn 0.21 since the `PolynomialLibrary` object imports a function from sklearn not present in earlier versions. See dynamicslab#51 .

Fix remaining sphinx-incompatible docstrings.

Update PyPI token.

fix directly called pytest fixture