v0.2.3

Compatibility issue with harmonypy>=0.2.0 fixed

v0.2.2

Minor bugs are fixed:

1. .A -> .toarray() for sparse matrices,
2. adata_ref.obsm["X_pca"] was changed in the previous implementation because of incorrect reassignment of the variable, now it's fixed,
3. other minor improvements.

v0.2.1

Minor bug fixes and improvements.