Allow optparse-applicative 0.16 (#336)

Author: tfausak

stylish-haskell.cabal

@@ -89,7 +89,7 @@ Executable stylish-haskell
   Build-depends:
     stylish-haskell,
     strict               >= 0.3  && < 0.5,
-    optparse-applicative >= 0.12 && < 0.16,
+    optparse-applicative >= 0.12 && < 0.17,
     -- Copied from regular dependencies...
     aeson            >= 0.6    && < 1.6,
     base             >= 4.8    && < 5,