Handle redirect for https 1 time.
Handle redirect for https 1 time.

Downloads facility of Bitbucket and Github use redirect.
So I handle redirect only once.
It must be enough for my use case.
Also this fix the download count problem (never increment download count for previous update).

NobuoK/xyzzy,NobuoK/xyzzy,NobuoK/xyzzy,NobuoK/xyzzy,NobuoK/xyzzy