relax bounds on base
relax bounds on base

This is necessary for compatibility with the stack resolver 4.2
FranklinChen/write-you-a-haskell,sdiehl/write-you-a-haskell,sdiehl/write-you-a-haskell,sdiehl/write-you-a-haskell,FranklinChen/write-you-a-haskell,sdiehl/write-you-a-haskell,yupferris/write-you-a-haskell,FranklinChen/write-you-a-haskell,yupferris/write-you-a-haskell,sdiehl/write-you-a-haskell,yupferris/write-you-a-haskell,FranklinChen/write-you-a-haskell,FranklinChen/write-you-a-haskell,FranklinChen/write-you-a-haskell,sdiehl/write-you-a-haskell,yupferris/write-you-a-haskell,yupferris/write-you-a-haskell,yupferris/write-you-a-haskell