Upgrades dependencies to build on stackage nightly.

ringo-app/ringo-app.cabal

@@ -29,7 +29,7 @@ executable ringo
                        vector               >=0.10    && <0.12,
                        directory            >=1.2     && <1.3,
                        filepath             >=1.3     && <1.5,
-                       aeson                >=0.8     && <0.12,
+                       aeson                >=0.8     && <1.1,
                        Cabal                >=1.18    && <1.25,
                        template-haskell     >=2.9     && <2.12,
                        ringo