Updated changelog and readme.

Author: jdantonio

CHANGELOG.md

@@ -15,6 +15,7 @@
 * Deprecated all clock-time based timer scheduling
   - Only support scheduling by delay
   - Effects `Concurrent.timer`, `TimerSet`, and `ScheduledTask`
+* Added new `ReadWriteLock` class
 * Consistent `at_exit` behavior for Java and Ruby thread pools.
 * Added `at_exit` handler to Ruby thread pools (already in Java thread pools)
   - Ruby handler stores the object id and retrieves from `ObjectSpace`

README.md

@@ -89,6 +89,7 @@ This library contains a variety of concurrency abstractions at high and low leve
 * [M-Structures](http://ruby-concurrency.github.io/concurrent-ruby/Concurrent/MVar.html) (MVar)
 * [Thread-local variables](http://ruby-concurrency.github.io/concurrent-ruby/Concurrent/ThreadLocalVar.html)
 * [Software transactional memory](http://ruby-concurrency.github.io/concurrent-ruby/Concurrent/TVar.html) (TVar)
+* [ReadWriteLock](http://ruby-concurrency.github.io/concurrent-ruby/Concurrent/ReadWriteLock.html)
 
 ## Usage