Writing pandas.Series fails

[dbrakenhoff]

Does Pystore support writing pandas.Series? I'm getting an error when attempting to write a pandas.Series to a pystore.collection because the pandas.Series.memory_usage() returns an int instead of a pandas.Series. And calling .sum on an int raises an error.

The line where this occurs is shown below:

pystore/pystore/collection.py

Lines 131 to 132 in 40de1d5

	if npartitions is None and chunksize is None:
	memusage = data.memory_usage(deep=True).sum()

Not sure whether this is an issue, but I figured I'd ask!