Use io-classes-1.1.0.0

Author: coot

typed-protocols/typed-protocols.cabal

@@ -34,7 +34,7 @@ library
                    , TypeOperators
                    , BangPatterns
   build-depends:     base,
-                     io-classes ^>= 1.0
+                     io-classes >= 1.0 && < 1.2
 
   hs-source-dirs:    src
   default-language:  Haskell2010