[ANN] Release candidate for `mtl-2.3`

[Emily Pillmore]

Hello all,

Chessai and I are excited to announce a release candidate for `mtl`: [`mtl-2.3-rc3`]( https://github.com/haskell/mtl/releases/tag/v2.3-rc3 )!

## Timeline

The timeline for release will be as follows:

- This announcement marks the start of the timeline

- We will give 2 weeks of testing before considering release

- If no major issues are filed before then, `mtl-2.3-rc3` will be released as `mtl-2.3`, and if issues are found, they will be amended, and a new release candidate will be announced, resetting the 2 week period.

To test `mtl-2.3-rc3` for yourself, please feel free to add the following to your `cabal.project`:

```

source-repository-package

type: git

location: https://github.com/haskell/mtl.git

tag: 5d0f62b8007bb96e49f36a5544741cfe96a97130

```

or, if you're a stack user add this entry to your `extra-deps`:

```

- git: https://github.com/haskell/mtl.git

commit: 5d0f62b8007bb96e49f36a5544741cfe96a97130

```

And make sure to adjust all bounds/`allow-newer` accordingly. Please note that this release of `mtl` is a full major version release, and *will be the last of the 2.x series before work begins on updating the mtl class hierarchy*.

## Changelog

* Add instances for `Control.Monad.Trans.Writer.CPS` and `Control.Monad.Trans.RWS.CPS` from `transformers` 0.5.6 and add `Control.Monad.Writer.CPS` and `Control.Monad.RWS.CPS`.

* `Control.Monad.Cont` now re-exports `evalCont` and `evalContT`

* Add `tryError`, `withError`, `handleError`, and `mapError` to

`Control.Monad.Error.Class`, and re-export from `Control.Monad.Except`.

* Remove `Control.Monad.List` and `Control.Monad.Error`

* Remove instances of deprecated `ListT` and `ErrorT`

* Remove re-exports of `Error`

* Add instances for `Control.Monad.Trans.Accum` and ` Control.Monad.Trans.Select ( http://control.monad.trans.select/ ) `

* Remove re-exports of `Control.Monad`, `Control.Monad.Fix` and `Data.Monoid` modules

I'd like to thank the many contributors who offered patches, tickets, and other help in the preparation of this release. We appreciate all of your help!

Happy hacking!

Emily
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