typo .

serving_completion.py

@@ -4,7 +4,7 @@ from typing import AsyncGenerator, AsyncIterator
 from vllm.logger import init_logger
 from vllm.utils import random_uuid
 from vllm.engine.async_llm_engine import AsyncLLMEngine
-from .protocol import (
+from protocol import (
     CompletionRequest,
     CompletionResponse,
     CompletionResponseChoice,