Update library

[NamPNQ]

Please update library to lastest version

[spitzbubchen]

When upgrading I only had issues with sqlalchemy and flask-admin. Flask-admin is pretty straight forward to sort out, however, sqlalchemy is a bit more tricky. Basically, you have to replace db.Model = sqlalchemy.declarative_base(cls=sqlalchemy.Model, name="Model", mapper=sqlalchemy.signalling_mapper, metaclass=_AdminBoundDeclarativeMeta) with db.Model = sqlalchemy.declarative_base(cls=sqlalchemy.Model, name="Model", mapper=sqlalchemy.orm.mapper, metaclass=_AdminBoundDeclarativeMeta) in __init__.py.