Fix httpx proxy

stream_translator_gpt/llm_translator.py

@@ -83,7 +83,7 @@ def _append_history_message(self, user_content: str, assistant_content: str):
 
     def _translate_by_gpt(self, translation_task: TranslationTask):
         # https://platform.openai.com/docs/api-reference/chat/create?lang=python
-        client = OpenAI(http_client=DefaultHttpxClient(proxies=self.proxy))
+        client = OpenAI(http_client=DefaultHttpxClient(proxy=self.proxy))
         system_prompt = 'You are a translation engine.'
         if self.use_json_result:
             system_prompt += " Output the answer in json format, key is translation."