Update run_async demo

examples/run_async.py

@@ -1,5 +1,5 @@
 from sanic import Sanic
-from sanic.response import json
+from sanic import response
 from multiprocessing import Event
 from signal import signal, SIGINT
 import asyncio
@@ -9,10 +9,10 @@ app = Sanic(__name__)
 
 @app.route("/")
 async def test(request):
-    return json({"answer": "42"})
+    return response.json({"answer": "42"})
 
 asyncio.set_event_loop(uvloop.new_event_loop())
-server = app.create_server(host="0.0.0.0", port=8001)
+server = app.create_server(host="0.0.0.0", port=8080)
 loop = asyncio.get_event_loop()
 task = asyncio.ensure_future(server)
 signal(SIGINT, lambda s, f: loop.stop())