Add MonadReader and MonadState instances #24
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* I've pretty well convinced myself that this instance obeys the `MonadReader` laws [proposed by Heinrich Apfelmus](haskell/mtl#5 (comment)) and the ones [proposed by Li-yao Xia](haskell/mtl#5 (comment)), so I think it should be added. * The `MonadState` instance is trivial. Closes nikita-volkov#23.
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I've pretty well convinced myself that this obeys the
MonadReaderlaws proposed by Heinrich Apfelmus and the ones proposed by Li-yao Xia, so I think it should be added.The
MonadStateinstance is trivial.Closes #23.