v0.6.1: updated SQLAlchemy in requirements.txt to fix moderate security issues.
v0.6.0: added support for xlsx extraction.
v0.5.0: added limited support for Postgresql database.
v0.4.5: fixed dependencies in setup.py.
v0.4.4: added support for massively reading Px files from a given directory.
v0.4.3: added different encodings for csv and px in extractor px.
v0.4.2: added support for parametrized columns load in bulk insert and upsert.
