Fix MinTLS-Version 1.2

Author: hons82

cmd/tunnel/tunnel.go

@@ -146,6 +146,7 @@ func tlsConfig(config *ClientConfig) (*tls.Config, error) {
 	return &tls.Config{
 		ServerName:         host,
 		Certificates:       []tls.Certificate{cert},
+		MinVersion:         tls.VersionTLS12,
 		InsecureSkipVerify: roots == nil,
 		RootCAs:            roots,
 	}, nil