fix guzzle get parameters

Author: MahdiMajidzadeh

src/Collection.php

@@ -65,7 +65,7 @@ private function execute($url, $params)
                 'Accept-Version' => 'v1',
                 'Authorization'  => 'Client-ID '. config('unsplash.ApplicationID')
             ],
-            'form_params' => $params
+            'query' => $params
         ]);
         $body = (string) $response->getBody();
         $this->response = json_decode($body);

src/Photo.php

@@ -84,7 +84,7 @@ private function execute($url, $params)
                 'Accept-Version' => 'v1',
                 'Authorization'  => 'Client-ID '. config('unsplash.ApplicationID')
             ],
-            'form_params' => $params
+            'query' => $params
         ]);
         $body = (string) $response->getBody();
         $this->response = json_decode($body);

src/Search.php

@@ -50,7 +50,7 @@ private function execute($url, $params)
                 'Accept-Version' => 'v1',
                 'Authorization'  => 'Client-ID '. config('unsplash.ApplicationID')
             ],
-            'form_params' => $params
+            'query' => $params
         ]);
         $body = (string) $response->getBody();
         $this->response = json_decode($body);

src/User.php

@@ -65,7 +65,7 @@ private function execute($url, $params)
                 'Accept-Version' => 'v1',
                 'Authorization'  => 'Client-ID '. config('unsplash.ApplicationID')
             ],
-            'form_params' => $params
+            'query' => $params
         ]);
         $body = (string) $response->getBody();
         $this->response = json_decode($body);