* Wheels are no longer built for pmdarima on Python <3.6, and backward-compatibility is no longer guaranteed for older python versions.
* The `exogenous` argument has been deprecated in favor of `X` - See [the RFC](https://github.com/alkaline-ml/pmdarima/pull/372) and [the PR](https://github.com/alkaline-ml/pmdarima/pull/385) for more information. Beginning in version 2.0, the `exogenous` argument will raise an error.
* Migrate random searches into the auto-solvers interface
* Random searches now perform unit root tests to prevent models with near non-invertible parameters
* The default value of `suppress_warnings` has changed to `True`. The primary reason for this is that most warnings emitted come from unit root tests, which are very noisy. `DeprecationWarnings` and other warnings generated from user input will still be emitted.
* Move `ModelFitWarning` from `pmdarima.arima.warnings` to `pmdarima.warnings`
* Fix a bug where the `pmdarima.model_selection.RollingForecastCV` could produce too few splits for the given input data.
* Change pin for `setuptools` from `<50.0.0` to `!=50.0.0`, addressing 401
* Change pin for `statsmodels` from `<0.12.0` to `!=0.12.0`, addressing 376