* relevant functions now call
      value = _parseiso(value)
* wrote inline documentation, and short subparagraph to README.md
* have not tested code in any way except the existing pytests which all succeeded
* tox gives mypy errors. I was able to remove some, but not all.
* tox gives lint errors. Have not figured out how to see what causes the errors.
* tox gives griffe error, ast.BoolOp, but did so even before I edited code
* not sure if Im using tox correctly. I simply run 'tox'

so I removed the ability for _isoparse() to parse into datetime.time.
I edited inline documentation and README.md accordingly.

Co-authored-by: Hugo van Kemenade <[email protected]>

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…erifies value is not of type dt.date