README.md in slack-api-1.3.0 vs README.md in slack-api-1.4.0

- old
+ new

@@ -37,13 +37,9 @@
 
 ## Examples
 
 [https://github.com/aki017/slack-ruby-gem/tree/dev/examples](https://github.com/aki017/slack-ruby-gem/tree/dev/examples)
 
-## RTM
-
-[Slack Bot Real Time Messaging API Integration in Ruby Tutorial](http://code.dblock.org/2015/04/28/slack-bot-real-time-messaging-api-integration-tutorial.html) thanks @dblock
-
 ## Contributing
 
 1. Fork it ( http://github.com/aki017/slack-ruby-gem/fork )
 2. Create your feature branch (`git checkout -b my-new-feature`)
 3. Commit your changes (`git commit -am 'Add some feature'`)