Update Readme.md

add a notes on code change.
2017-08-12 17:17:23 +09:00 · 2017-08-12 17:17:23 +09:00 · 272b6fc43c
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@ -28,6 +28,9 @@ ruby myapp.rb

 View at: [http://localhost:4567](http://localhost:4567)

+The code you changed will not take effect until you restart the server.  
+Please restart the server every time you change or use [sinatra/reloader](http://www.sinatrarb.com/contrib/reloader).  
+
 It is recommended to also run `gem install thin`, which Sinatra will
 pick up if available.