Fix PEP8 in Hello World example

README.md

@@ -33,13 +33,17 @@ All tests were run on an AWS medium instance running ubuntu, using 1 process.  E
 from sanic import Sanic
 from sanic.response import json
 
+
 app = Sanic()
 
+
 @app.route("/")
 async def test(request):
     return json({"hello": "world"})
 
-app.run(host="0.0.0.0", port=8000)
+if __name__ == '__main__':
+    app.run(host="0.0.0.0", port=8000)
+
 ```
 
 ## Installation