add rtl option to readme

README.md

@@ -77,6 +77,9 @@ Reveal.initialize({
 	// Loop the presentation
 	loop: false,
 
+	// Change the presentation direction to be RTL
+	rtl: false,
+
 	// Number of milliseconds between automatically proceeding to the 
 	// next slide, disabled when set to 0, this value can be overwritten
 	// by using a data-autoslide attribute on your slides