Support transforming ℉ into something

[circuitmike]

I'd like to see unidecode turn ℉ into something else, although I'm not sure what the best option for replacing the degree symbol is. degF maybe? Just F?

[jwilk]

>>> import unidecode
>>> unidecode.unidecode('°F')
'degF'

So it would make sense to decode ℉ as degF too.