fix naming issue

src/Puzzle/Client.php

@@ -252,27 +252,6 @@ public function performRequest($method, $uri, $params = null, $body = null)
         }
     }
 
-    /**
-     * Serialize assoc array into JSON string
-     *
-     * @param string|array $data Assoc array to encode into JSON
-     *
-     * @return string
-     */
-    public function serialize($data)
-    {
-        if (is_string($data) === true) {
-            return $data;
-        } else {
-            $data = json_encode($data);
-            if ($data === '[]') {
-                return '{}';
-            } else {
-                return $data;
-            }
-        }
-    }
-
     /**
      * precess the request
      *
@@ -399,7 +378,7 @@ protected function execute($method, $uri, $params, $body)
                 throw new ClientException("Error setting cURL Header options.");
             }
         }
-        
+
         $result = curl_exec($this->getHandle());
         $response["data"] = $this->getSerializer()->deserialize($result);
         $response["status"] = $this->getStatusCode();