Fixed amphp/artax#92 (bad SNI host)
Fixed amphp/artax#92 (bad SNI host)

WAS: sni = "129.187.139.55"
SHOULD: sni = "opacplus.bib-bvb.de"

In case SNI does not match the actual hostname, the server may error the connection; set SNI to the value *before* the DNS lookup...

amphp/socket,amphp/socket,rdlowrey/nbsock