Fix bounds for Diff

0.5 couldn't be matched by ^0.5.0

Author: felixonmars

arch-hs.cabal

@@ -46,7 +46,7 @@ common common-options
     , conduit-extra                ^>=1.3.5
     , containers
     , deepseq                      ^>=1.4.4 || ^>=1.5.0
-    , Diff                         ^>=0.4.0 || ^>=0.5.0
+    , Diff                         ^>=0.4.0 || ^>=0.5
     , directory                    ^>=1.3.6
     , filepath                     ^>=1.4.2
     , hackage-db                   ^>=2.1.0