[BUG] thread main panicked error

[JayBrown]

When trying sunshine '#North Pole' and sunshine #South Pole, there's a thread 'main' panicked at 'invalid or out-of-range datetime' error.

Same when trying the coordinates: sunshine '@90.0 0.0' and sunshine '@-90.0 0.0

[JayBrown]

I assume it's due to the fact that the sun is currently up all the time on the North Pole, and down all the time on the South Pole.

In these cases, maybe sunshine can just return permanent day and permanent night as output. (?)