Merge pull request #21 from MarcoMuellner/15-some-routes-call-responsejson-twice

:fix: Correct usage of response in aiohttp

Author: MarcoMuellner

src/openapi_python_generator/language_converters/python/templates/aiohttp.jinja2

@@ -30,10 +30,10 @@ async def {{ operation_id }}({{ params }}) -> {% if return_type.type is none or
             return None
 {% elif return_type.complex_type %}
     {%- if return_type.list_type is none %}
-            return {{ return_type.type.converted_type }}(**response.json()) if response.json() is not None else {{ return_type.type.converted_type }}()
+            return {{ return_type.type.converted_type }}(**response) if response is not None else {{ return_type.type.converted_type }}()
     {%- else %}
-            return [{{ return_type.list_type }}(**item) for item in response.json()]
+            return [{{ return_type.list_type }}(**item) for item in response]
     {%- endif %}
 {% else %}
-            return response.json()
+            return response
 {% endif %}