fix parameter on func def

Author: mattmakai

docker-flask-mac/app.py

@@ -5,8 +5,8 @@
 
 
 @app.route("/")
-def hello(request):
-    return Response("Hello from a Flask app within your Docker container!")
+def hello():
+    return Response("Hi from your Flask app running in your Docker container!")
 
 
 if __name__ == "__main__":