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Remove unused dependency of `beam-postgres` on `haskell-src-exts` #619

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10 warnings

The import of ‘Control.Applicative’ is redundant

Module ‘Control.Monad.Writer’ does not export ‘(<>)’.

The import of ‘Control.Monad.Identity’ is redundant

Pattern match is redundant

The import of ‘Control.Applicative’ is redundant

Module ‘Control.Monad.Writer’ does not export ‘(<>)’.

The import of ‘Control.Applicative’ is redundant

The import of ‘Data.Semigroup’ is redundant

In the use of ‘head’

Module ‘Data.Aeson’ does not export ‘json’.