modify ;quotecategories command to order by the ammount of quotes a category has

systems/quote.rb

@@ -43,7 +43,7 @@ module QuoteSystem
   end
 
   command(:quotecategories, aliases: [:qc]) do |event, *message|
-    categories = db.execute("SELECT DISTINCT category FROM quotes")
+    categories = db.execute("SELECT category FROM quotes GROUP BY category ORDER BY COUNT(*) DESC;")
     event.channel.send_message("**Categories**: #{categories[0..].join(' ')}")
     nil
   end