Allow strict 0.4

Builds fine and all tests pass here.

Author: felixonmars

stylish-haskell.cabal

@@ -77,7 +77,7 @@ Executable stylish-haskell
 
   Build-depends:
     stylish-haskell,
-    strict               >= 0.3  && < 0.4,
+    strict               >= 0.3  && < 0.5,
     optparse-applicative >= 0.12 && < 0.16,
     -- Copied from regular dependencies...
     aeson            >= 0.6    && < 1.6,