pyinstall outdated scikit-learn install command crash

[Shantanu-Parmar]

Doing pip install karoo_gp, a standard error for incorrect scikitlearn install command triggers crashing install each time.
A simple replacement in the requirements.txt and setup.py with new packaging would suffice.

sklearn ---------->scikit-learn

Also, a workaround is running this:

SET SKLEARN_ALLOW_DEPRECATED_SKLEARN_PACKAGE_INSTALL=True