Merge branch 'master' of github.com:DoubleML/doubleml-serverless into 0.0.X

Author: MalteKurz

setup.py

@@ -20,12 +20,12 @@
     url='https://github.com/DoubleML/doubleml-serverless',
     packages=find_packages(exclude=['aws_lambda_app*']),
     install_requires=[
-        'DoubleML>=0.1.2',
+        'DoubleML>=0.2.2',
         'joblib',
         'numpy',
         'pandas',
         'scipy',
-        'sklearn',
+        'scikit-learn==0.23.2',
         'statsmodels',
         'aiobotocore==1.1.2',
         'boto3==1.14.44',