Replace sklearn with correct scikit-learn dependency in setup.py

setup.py

@@ -69,12 +69,12 @@ setup(name='py_wake',
               'sphinx',  # generating documentation
               'sphinx_rtd_theme',  # docs theme
               'line_profiler',  # to check speed
-              'sklearn',  # MinMaxScaler
+              'scikit-learn',  # MinMaxScaler
               'tensorflow',  # load surrogates
               'ipywidgets',  # notebook widgets
           ],
           'loads': [
-              'sklearn',  # MinMaxScaler
+              'scikit-learn',  # MinMaxScaler
               'tensorflow',  # load surrogates
           ]},
       zip_safe=True)