The link to dataflow documentation was broken

It was expecting the Dataflow having its own file.

Author: iNecas

README.md

@@ -56,7 +56,7 @@ This library contains a variety of concurrency abstractions at high and low leve
 * [Agent](http://ruby-concurrency.github.io/concurrent-ruby/Concurrent/Agent.html): A single atomic value that represents an identity.
 * [Async](http://ruby-concurrency.github.io/concurrent-ruby/Concurrent/Async.html): A mixin module that provides simple asynchronous behavior to any standard class/object or object.
 * [Future](http://ruby-concurrency.github.io/concurrent-ruby/Concurrent/Future.html): An asynchronous operation that produces a value.
-  * [Dataflow](http://ruby-concurrency.github.io/concurrent-ruby/Concurrent/Dataflow.html): Built on Futures, Dataflow allows you to create a task that will be scheduled when all of its data dependencies are available.
+  * [Dataflow](http://ruby-concurrency.github.io/concurrent-ruby/Concurrent.html#dataflow-class_method): Built on Futures, Dataflow allows you to create a task that will be scheduled when all of its data dependencies are available.
 * [Promise](http://ruby-concurrency.github.io/concurrent-ruby/Concurrent/Promise.html): Similar to Futures, with more features.
 * [ScheduledTask](http://ruby-concurrency.github.io/concurrent-ruby/Concurrent/ScheduledTask.html): Like a Future scheduled for a specific future time.
 * [TimerTask](http://ruby-concurrency.github.io/concurrent-ruby/Concurrent/TimerTask.html): A Thread that periodically wakes up to perform work at regular intervals.