`ActionT`'s `MonadFail` instance removed in `scotty-0.20`

[RyanGlScott]

PR #314 removed the MonadFail instance for ActionT, which I noticed when trying to upgrade one of my projects:

[2 of 2] Compiling Web.Scotty.Comet ( Web/Scotty/Comet.hs, interpreted )

Web/Scotty/Comet.hs:157:28: error:
    • No instance for (MonadFail
                         (Web.Scotty.Internal.Types.ActionT IO))
        arising from a use of ‘fail’
    • In the first argument of ‘($)’, namely ‘fail’
      In the expression:
        fail $ "Expected Object, received: " ++ show wrappedVal
      In a case alternative:
          _ -> fail $ "Expected Object, received: " ++ show wrappedVal
    |
157 |                       _ -> fail $ "Expected Object, received: " ++ show wrappedVal
    |                            ^^^^

This isn't documented in the CHANGELOG as a breaking change, so I'm unclear if this was intentional or not. If it was intentional, could you document in this in the CHANGELOG and suggest a recommended alternative?

[ocramz]

Whoops! Sorry @RyanGlScott , I missed this when autoderiving a bunch of instances. I can document this in the changelog, make a bugfix release and deprecate 20.0.

[ocramz]

Fixed this in #326

[ocramz]

@RyanGlScott does 0.20.1 work fine for you now?

[RyanGlScott]

I did some preliminary testing, and my projects all build without issue using scotty-0.20.1. Thanks!