Ml-stars

* Upgrade python tests & remove python 3.7 [Issue 11](https://github.com/sintel-dev/ml-stars/issues/11) - by sarahmish
* Add deprecation warning for old ARIMA primitive [Issue 10](https://github.com/sintel-dev/ml-stars/issues/10) - by sarahmish
* Remove python 3.6 [Issue 9](https://github.com/sintel-dev/ml-stars/issues/9) - by sarahmish
* Add support for python 3.10 & 3.11 [Issue 8](https://github.com/sintel-dev/ml-stars/issues/8) - by sarahmish

* Update ``keras`` adapter [Issue 7](https://github.com/sintel-dev/ml-stars/issues/7) - by sarahmish

* Add python 3.9 [Issue 6](https://github.com/sintel-dev/ml-stars/issues/6) - by sarahmish

* Fix ARIMA adapter [Issue 5](https://github.com/sintel-dev/ml-stars/issues/5) - by sarahmish
* Add Documentation [Issue 4](https://github.com/sintel-dev/ml-stars/issues/4) - by sarahmish

First official ml-stars release to PyPI: https://pypi.org/project/ml-stars/