Mistake in _read_data

[kolcz]

adafruit-circuitpython-scd4x version 1.4.2

In method _read_data of class SCD4x is mistake in calculating self._temperature and **self._realtive_humidity. Denominator is missing "- 1" according to documentation.
Code snippet from library from pip:

Fragment from Data Sheet:

[kolcz]

#20

[FoamyGuy]

resolved by #20