[New]

• The first element of the tuple can be one of the following: string, list, or any other callable function. Check out "dynamic column names" section for more information (https://github.com/scikit-learn-contrib/sklearn-pandas#dynamic-columns)

• Officially added support for Python 3.9 and deprecated support for Python 3.9
• Added deprecation warning for NumericalTransformer. NumericalTransformer will be removed in the next release.
• Fixed pickling issue causing integration issues with Baikal.
• Started publishing package to conda repo

• Explicitly handling serialization (#224)
• document fixes
• Making transform function thread-safe (#194)
• Switched to nox for unit testing (#226)