Allow prettyprinter-1.4.0

Author: sjakobi

hnix.cabal

@@ -517,7 +517,7 @@ library
     , mtl >= 2.2.2 && < 2.3
     , optparse-applicative >= 0.14.3 && < 0.15 || >= 0.15.0.0 && < 0.16
     , parser-combinators >= 1.0.1 && < 1.1 || >= 1.2.0 && < 1.3
-    , prettyprinter >= 1.2.1 && < 1.3 || >= 1.3.0 && < 1.4
+    , prettyprinter >= 1.2.1 && < 1.5
     , process >= 1.6.3 && < 1.7
     , ref-tf >= 0.4.0 && < 0.5
     , regex-tdfa >= 1.2.3 && < 1.3