warp-tls-3.4.7: HTTP over TLS support for Warp via the TLS package

SSLv1 and SSLv2 are obsoleted by IETF. We should use TLS 1.2 (or TLS 1.1 or TLS 1.0 if necessary). HTTP/2 can be negotiated by ALPN. API docs and the README are available at http://www.stackage.org/package/warp-tls.