add RemoteAddr function in session

session.go

@@ -2,6 +2,7 @@ package melody
 
 import (
 	"errors"
+	"net"
 	"net/http"
 	"sync"
 	"time"
@@ -236,3 +237,8 @@ func (s *Session) MustGet(key string) interface{} {
 func (s *Session) IsClosed() bool {
 	return s.closed()
 }
+
+// RemoteAddr returns RemoteAddr of the connection.
+func (s *Session) RemoteAddr() net.Addr {
+	return s.conn.RemoteAddr()
+}