hid: mention Go 1.12 alternative to TLS autodetection

hid/main.go

@@ -172,6 +172,10 @@ func splitString(s, delims string, ignoreEmpty bool) (result []string) {
 //  SSL3/TLS:    <22>    |    <3>    | xxxx xxxx
 //            (handshake)|  (protocol version)
 //
+// Note that Go 1.12's crypto/tls offers a slightly more straight-forward
+// solution: "If a client sends an initial message that does not look like TLS,
+// the server will no longer reply with an alert, and it will expose the
+// underlying net.Conn in the new field Conn of RecordHeaderError."
 func detectTLS(sysconn syscall.RawConn) (isTLS bool) {
 	sysconn.Read(func(fd uintptr) (done bool) {
 		var buf [3]byte