Allow QuickCheck 2.12

ndmitchell · ndmitchell · commit efff50b6eec6 · 2018-09-07T12:30:35.000+01:00
diff --git a/filepath.cabal b/filepath.cabal
@@ -64,4 +64,4 @@ test-suite filepath-tests
     build-depends:
         filepath,
         base,
-        QuickCheck >= 2.7 && < 2.12
+        QuickCheck >= 2.7 && < 2.13
