Update README.md

Author: soulfly

samples/chat_bots/rivescript/README.md

@@ -5,4 +5,4 @@ This is an example of 1-to-1 chatbot with [RiveScript](https://www.rivescript.co
 # Guide
 Read Chat Bots guide to understand how to build own bot for QuickBlox with RiveScript.
 
-[http://quickblox.com/developers/ChatBots](http://quickblox.com/developers/ChatBots)
+[https://quickblox.com/developers/ChatBots](https://quickblox.com/developers/ChatBots)