Adding many MonoLookup and MonoIndexable instances.

Author: recursion-ninja

mono-traversable-keys.cabal

@@ -25,6 +25,7 @@ library
       bytestring           >= 0.9     && < 1.0,   
       containers           >= 0.3     && < 0.7,
       free                 >= 4       && < 6.0,
+      hashable             >= 1.2     && < 2.0,          
       keys                 >= 3       && < 4.0,          
       mono-traversable     >= 1       && < 2.0,          
       semigroups           >= 0.8.3.1 && < 1.0,