Documentation suggestion

[W4KRL]

I suggest you include the units of measure in your documentation: Celsius, relative humidity, pressure.

[JVKran]

Thanks again Karl! That's a great idea. I actually wouldn't have thought someone in a part of the world where other units are used, would want to use this library. But actually it makes sense. This has been added in the documentation and code itself. Take a look at the examples to see the changes.