update readme (#2197)

Author: dennisbader

README.md

@@ -232,7 +232,7 @@ on bringing more models and features.
 | [Prophet](https://unit8co.github.io/darts/generated_api/darts.models.forecasting.prophet_model.html#darts.models.forecasting.prophet_model.Prophet) | [Prophet repo](https://github.com/facebook/prophet)                                                                                                                                                                               | 🟩 🟥                                                        | 🟥 🟩 🟥                                                                 | 🟩 🟥                                                                    | 🟥                                        |
 | [FFT](https://unit8co.github.io/darts/generated_api/darts.models.forecasting.fft.html#darts.models.forecasting.fft.FFT) (Fast Fourier Transform)                                                                                                                         |                                                                                                                                                                                                                                   | 🟩 🟥                                                        | 🟥 🟥 🟥                                                                 | 🟥 🟥                                                                    | 🟥                                        |
 | [KalmanForecaster](https://unit8co.github.io/darts/generated_api/darts.models.forecasting.kalman_forecaster.html#darts.models.forecasting.kalman_forecaster.KalmanForecaster) using the Kalman filter and N4SID for system identification                                                               | [N4SID paper](https://people.duke.edu/~hpgavin/SystemID/References/VanOverschee-Automatica-1994.pdf)                                                                                                                              | 🟩 🟩                                                        | 🟥 🟩 🟥                                                                 | 🟩 🟥                                                                    | 🟥                                        |
-| [Croston](https://unit8co.github.io/darts/generated_api/darts.models.forecasting.croston.html#darts.models.forecasting.croston.Croston) method                                                                                                                                                          |                                                                                                                                                                                                                                   | 🟩 🟥                                                        | 🟥 🟥 🟥                                                                 | 🟥 🟥                                                                    | 🟥                                        |
+| [Croston](https://unit8co.github.io/darts/generated_api/darts.models.forecasting.croston.html#darts.models.forecasting.croston.Croston) method                                                                                                                                                          |                                                                                                                                                                                                                                   | 🟩 🟥                                                        | 🟥 🟩 🟥                                                                 | 🟥 🟥                                                                    | 🟥                                        |
 | **Regression Models**<br/>([GlobalForecastingModel](https://unit8co.github.io/darts/userguide/covariates.html#global-forecasting-models-gfms))                                                                                                                                                          |                                                                                                                                                                                                                                   |                                                              |                                                                          |                                                                          |                                           |
 | [RegressionModel](https://unit8co.github.io/darts/generated_api/darts.models.forecasting.regression_model.html#darts.models.forecasting.regression_model.RegressionModel): generic wrapper around any sklearn regression model                                                                          |                                                                                                                                                                                                                                   | 🟩 🟩                                                        | 🟩 🟩 🟩                                                                 | 🟥 🟥                                                                    | 🟩                                        |
 | [LinearRegressionModel](https://unit8co.github.io/darts/generated_api/darts.models.forecasting.linear_regression_model.html#darts.models.forecasting.linear_regression_model.LinearRegressionModel)                                                                                                     |                                                                                                                                                                                                                                   | 🟩 🟩                                                        | 🟩 🟩 🟩                                                                 | 🟩 🟩                                                                    | 🟩                                        |