Allow fractional height and width attributes

[tuttoaposto]

The function get_length_value_unit() currently supports integer length (e.g. 1em) but not fractional length (e.g. 0.88em). Is it possible to get this updated 🙏 and make fontawesome really awesome 🌟?? This can be achieved by, for example, changing

grepl("^[0-9]+[a-z]+$", css_length)

to

grepl("^[0-9]+[.][0-9]+)?[a-z]+$", css_length)

and

unit <- sub("^[0-9]+", "", css_length)

to

unit <- sub("^[0-9]+([.][0-9]+)?", "", css_length)

Thanks you!