https redirects are not properly handled

[vatosarmat]

Request is the same, but curl handles it, while luasocket doesn't

~/Test/lua$ lua -e 'local _, c = require("socket.http").request("https://api.coincap.io/v2/assets"); print(c)'
301
~/Test/lua$ curl -lso "/dev/null" -w "%{http_code}\n" "https://api.coincap.io/v2/assets"
200

Ubuntu 18.04 Lua 5.3.3 Copyright (C) 1994-2016 Lua.org, PUC-Rio