fix response handling for content types that contain `application/jso…

…n` (#12)

src/models/response.py

@@ -20,7 +20,7 @@ class Response:
 
     def __getattr__(self, item):
         if item == "body":
-            if self.__response.headers['Content-Type'] == 'application/json':
+            if 'application/json' in self.__response.headers['Content-Type']:
                 body = self.__response.json()
             else:
                 body = self.__response.content