Hello

I've noticed there's a (closed) issue about having a From<Box<dyn Error + Send + Sync>> impl, that refers to wanting that from std (#66)

But would it make sense to have an explicit constructor in the meantime? Eg. Error::from_box_error(..)? That way one would have to write some kind of map_error(Error::from_box_error)? instead of just ?, but that's probably better than nothing.