hamlet version bump

yesod.cabal

@@ -30,7 +30,7 @@ library
                    , text                      >= 0.5      && < 0.11
                    , template-haskell          >= 2.4      && < 2.6
                    , web-routes-quasi          >= 0.6      && < 0.7
-                   , hamlet                    >= 0.5.1    && < 0.6
+                   , hamlet                    >= 0.5.1    && < 0.7
                    , blaze-builder             >= 0.1      && < 0.2
                    , transformers              >= 0.2      && < 0.3
                    , clientsession             >= 0.4.0    && < 0.5