Update CHANGELOG.md

CHANGELOG.md

@@ -10,6 +10,7 @@ Feature - [decodeInExecutor](https://github.com/redisson/redisson/wiki/2.-Config
 Feature - `lockAsync` and `tryLockAsync` methods with threadId param added to RedissonMultiLock object  
 Improvement - default values of `nettyThreads` and `threads` settings set to `32` and 16` respectively  
 Improvement - Redis nodes with empty names in cluster config should be skipped  
+Fixed - `RFuture.cause()` method should return CancellationException and not throw it  
 Fixed - continues handling of RedisLoadingException leads to excessive load  
 Fixed - slave's connection pools are not initialized when it back from failover  
 Fixed - Buffer leak during failover and RBatch object execution