restrict version of scikit-learn (#431)
restrict version of scikit-learn (#431)

* Attempt at fixing 1HE extension for scikit-learn

* Attempt at fixing 1HE extension for scikit-learn - fix imports

* Restrict version of scikit-learn

combust-ml/mleap,combust/mleap,combust-ml/mleap,combust/mleap,combust-ml/mleap,combust/mleap