feat(core) add processing_language in Response model

Author: jhoudan

src/Response.php

@@ -18,7 +18,7 @@ public function __construct($json)
         $response = json_decode($json->body);
         $this->entities = [];
 
-	$this->raw = $response->results;
+        $this->raw = $response->results;
         $this->act = $response->results->act;
         $this->type = $response->results->type;
         $this->source = $response->results->source;
@@ -33,6 +33,7 @@ public function __construct($json)
 
         $this->uuid = $response->results->uuid;
         $this->language = $response->results->language;
+        $this->processing_language = $response->results->processing_language;
         $this->version = $response->results->version;
         $this->timestamp = $response->results->timestamp;
         $this->status = $response->results->status;