Bump containers upper bound

hsc2hs.cabal

@@ -55,7 +55,7 @@ Executable hsc2hs
     Other-Extensions: CPP, NoMonomorphismRestriction
 
     Build-Depends: base       >= 4   && < 5,
-                   containers >= 0.2 && < 0.6,
+                   containers >= 0.2 && < 0.7,
                    directory  >= 1   && < 1.4,
                    filepath   >= 1   && < 1.5,
                    process    >= 1.1 && < 1.7