replace custom query encoding with built-in http_build_query2017 update

Author: tcdent

restclient.php

@@ -3,7 +3,7 @@
 /**
  * PHP REST Client
  * https://github.com/tcdent/php-restclient
- * (c) 2013-2016 Travis Dent <[email protected]>
+ * (c) 2013-2017 Travis Dent <[email protected]>
  */
 
 class RestClientException extends Exception {}
@@ -160,7 +160,7 @@ public function execute($url, $method='GET', $parameters=[], $headers=[]){
         // merged with parameters specified in the default options.
         if(is_array($parameters)){
             $parameters = array_merge($client->options['parameters'], $parameters);
-            $parameters_string = $client->format_query($parameters);
+            $parameters_string = http_build_query($parameters);
         }
         else
             $parameters_string = (string) $parameters;
@@ -201,10 +201,6 @@ public function execute($url, $method='GET', $parameters=[], $headers=[]){
         return $client;
     }
 
-    public function format_query($parameters){
-        return http_build_query($parameters);
-    }
-    
     public function parse_response($response){
         $headers = [];
         $this->response_status_lines = [];