kazu-yamamoto/logger

Outdated reference to GHandler

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The Control.Monad.Logger docs say:

The MonadLogger class is implemented by monads that give access to a logging facility. If you're defining a custom monad, then you may define an instance of MonadLogger that routes the log messages to the appropriate place (e.g., that's what yesod-core's GHandler does). Otherwise, you may use the LoggingT monad included in this module (see runStderrLoggingT). To simply discard log message, use NoLoggingT.

IIRC, yesod hasn't had a GHandler type for awhile, so I think this reference is outdated