Pysindy

This release makes the `SINDy.score` function better conform to the call signature of metrics from `sklearn.metrics`. Resolves 80.

Fixes a minor bug in the `CustomLibrary` class for earlier releases of Scikit-learn (e.g. 0.21). Scikit-learn version 0.23 (the latest version) does not have this issue.

This is PySINDy's first major release, including source code, documentation-generating scripts, examples, unit tests, and a markdown version of the PySINDy JOSS submission. This release includes a DOI via Zenodo:

[](https://zenodo.org/badge/latestdoi/186055899)

Removes an extraneous print statement put in the code for debugging purposes.

* Expand allowable set of control input functions accepted by the `u` keyword argument of `SINDy.simulate` to include interpolating functions
* Relax optimizer complexity test

Documentation improvements:
- Fixed formatting of class attributes on documentation site
- Better code formatting for `SINDy` method docstrings
- Add missing class attributes to docstrings

Code improvements:
- More robust complexity test
- Add missing attributes to `SINDy` class, optimizers, and feature libraries