Added Ruby

Added Ruby lang in Syntax colorization languages list, one of the most used language (mostly in web with the framework Ruby on Rails). It could be attractive for the Ruby developers see their preferred language in the list.

website/index.html

@@ -85,7 +85,7 @@
 					<br>
 					<h4 title="Syntax colorization">Basic Syntax Colorization</h4>
 					<p>XML, PHP, C#, C++, Razor, Markdown, Diff, Java, VB, CoffeeScript, Handlebars, Batch, Pug, F#, Lua, Powershell,
-						Python, SASS, R, Objective-C</p>
+						Python, Ruby, SASS, R, Objective-C</p>
 					<br>
 					<p>Colorizers are implemented using <a href="monarch.html"
 						target="_blank">Monarch</a>.</p>