0.3.6 release

add absoluteHumidity + boiling functions (#20)

- add **absoluteHumidity(TC, RH)** from relative humidity
- add **boilingFahrenheit(feet)** boiling temperature Fahrenheit at height in feet.
- add **boilingCelsius(meter)** boiling temperature Celsius at height in meter.
- add **boilingMeter(Celsius)** inverse function of above.
- add example
- update keywords.txt
- update readme.md
- update GitHub actions
- update license 2023
- minor edits