remove ?notes from readme

README.md

@@ -413,7 +413,7 @@ If you want to customise reveal.js without running grunt.js you can alter the HT
 
 ## Speaker Notes
 
-reveal.js comes with a speaker notes plugin which can be used to present per-slide notes in a separate browser window. The notes window also gives you a preview of the next upcoming slide so it may be helpful even if you haven't written any notes. Append ```?notes``` to the presentation URL or press the 's' key on your keyboard to open the notes window.
+reveal.js comes with a speaker notes plugin which can be used to present per-slide notes in a separate browser window. The notes window also gives you a preview of the next upcoming slide so it may be helpful even if you haven't written any notes. Press the 's' key on your keyboard to open the notes window.
 
 By default notes are written using standard HTML, see below, but you can add a ```data-markdown``` attribute to the ```<aside>``` to write them using Markdown.