- Breaking changes:
- Drop support for Python < 3.9.
- Rename `lmdiag.info()` to `lmdiag.help()`
- The default style now follows matplotlib's style. To get the old one, call
`lmdiag.style.use("black_and_red")` before `lmdiag.plot()`.
- Fix crash for `linearmodels` with 2+ degrees of freedom.
- Add support for scikit-learn's `LinearRegression`
- Improve performance