Deprecation warning on loads

[ddannenb]

Python 3.10 - deprecation warning load.py ...

/Users/XXX/opt/anaconda3/envs/py3_10_8_pinon/lib/python3.10/site-packages/simfin/load.py:144: FutureWarning: The argument 'date_parser' is deprecated and will be removed in a future version. Please use 'date_format' instead, or read your data in as 'object' dtype and then call 'to_datetime'. df = pd.read_csv(path, sep=';', header=0,

I will do a pull request for this - but may be a few weeks ...