sni-hostname no longer settable

[steve-misky]

broken with v1.1.4

HttpConnectionOptions Class
http_connection_options:23

Change in 1.1.4 forces the sni_hostname, EVEN if already provided

@tls[:sni_hostname] = uri.host

Simple FIX (to retain the sni_hostname IF already provided

@tls[:sni_hostname] ||= uri.host