Add minVersion setting for TLS & XTLS (#77)

transport/internet/xtls/config.go

@@ -1,6 +1,7 @@
 package xtls
 
 import (
+	"crypto/tls"
 	"crypto/x509"
 	"sync"
 	"time"
@@ -202,6 +203,16 @@ func (c *Config) GetXTLSConfig(opts ...Option) *xtls.Config {
 		config.NextProtos = []string{"h2", "http/1.1"}
 	}
 
+	switch c.MinVersion {
+	case "1.0":
+		config.MinVersion = tls.VersionTLS10
+	case "1.1":
+		config.MinVersion = tls.VersionTLS11
+	case "1.2":
+		config.MinVersion = tls.VersionTLS12
+	case "1.3":
+		config.MinVersion = tls.VersionTLS13
+	}
 	return config
 }