directory 1.3.8.4
* Relax time version bounds to support 1.14.
( https://github.com/haskell/directory/issues/171 )
* Relax base version bounds to support 4.20.
( https://github.com/haskell/directory/issues/173 )
* Relax filepath version bounds to support 1.4.300 when os-string is
unavailable.
( https://github.com/haskell/directory/issues/175 )