This release incorporates a few bug fixes and enhancement.

v<0.9.1>, <07/12/2021> -- Improve COPOD by dropping pandas dependency. v<0.9.1>, <07/19/2021> -- Add memory efficienct COF. v<0.9.1>, <08/01/2021> -- Fix Pytorch Dataset issue. v<0.9.1>, <08/14/2021> -- Synchronize scikit-learn LOF parameters.