Fix formatting

README.md

@@ -63,7 +63,7 @@ async def example_view(request) -> HttpResponse:
     ``` python hl_lines="3"
     MIDDLEWARE = [
         # ...
-        'django_asgi_lifespan.middleware.LifespanStateMiddleware',
+        "django_asgi_lifespan.middleware.LifespanStateMiddleware",
         # ...
     ]
     ```