'Get the most recent version of a file in GridFS by ``"filename"``
or metadata fields.
Equivalent to calling :meth:`get_version` with the default
`version` (``-1``).
:Parameters:
- `filename`: ``"filename"`` of the file to get, or `None`
- `**kwargs` (optional): find files by custom metadata.'

def get_last_version(self, filename=None, **kwargs):

    return self.get_version(filename=filename, **kwargs)
