Congratulations to the new MTL maintainers!

Hello Everyone,

mtl-2.3 has been released. This release marks the first major version for the library in a long time, and addresses some longstanding issues that have taken years to fix. As a result, this will be a *breaking update* for many. Please review the following changelog notes: 

• Added 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.
  
• Require GHC 8.6 or higher, and cabal-install 3.0 or higher.
  
• Require transformers-0.5.6 or higher.
  
• Add Control.Monad.Accum for the MonadAccum type class, as well as the LiftingAccum deriving helper.
  
• Add Control.Monad.Select for the MonadSelect type class, as well as the LiftingSelect deriving helper.
  

A big thank you to all contributors and commentators, and a special thanks to Koz for picking up maintenance so swiftly. 

Happy hacking,

Emily

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