[#317] README: mention that http-kit.org is unmaintained
[#317] README: mention that http-kit.org is unmaintained

http-kit/http-kit,ptaoussanis/http-kit,http-kit/http-kit,http-kit/http-kit,http-kit/http-kit,ptaoussanis/http-kit,http-kit/http-kit,http-kit/http-kit,ptaoussanis/http-kit,ptaoussanis/http-kit,ptaoussanis/http-kit,ptaoussanis/http-kit