Changed method toJson to the method __toString. Same behaviour

Author: octante

src/Connection.php

@@ -178,7 +178,7 @@ public function isConnected()
     public function connect()
     {
         $this->streamSocket = $this->getStream($this->options->getAddress());
-        $msg = 'CONNECT '.$this->options->toJSON();
+        $msg = 'CONNECT '.$this->options;
         $this->send($msg);
     }
 

src/ConnectionOptions.php

@@ -85,7 +85,7 @@ public function getAddress()
      *
      * @return string
      */
-    public function toJSON()
+    public function __toString()
     {
         $a = [
             "lang" => $this->lang,