monad-unlift-ref-0.2.1: ChangeLog.md

## 0.2.1

* Add `MonadReader` instance for `StateRefT`
* Add `MonadReader` instance for `WriterRefT`

## 0.2.0

* Split out monad-unlift-ref

## 0.1.1.0

* Add `MonadResource` instances

## 0.1.0.0

* Initial release