Cabal revisions of syb-0.6

Hackage metadata revisions edit the .cabal file after upload; each diff below is one revision.

 name:                 syb
 version:              0.6
+x-revision: 1
 license:              BSD3
 license-file:         LICENSE
 author:               Ralf Lammel, Simon Peyton Jones, Jose Pedro Magalhaes
 
 Library
   hs-source-dirs:         src
-  build-depends:          base >= 4.0 && < 5.0
+  build-depends:          base >= 4.0 && < 4.10
   exposed-modules:        Data.Generics,
                           Data.Generics.Basics,
                           Data.Generics.Instances,

 name:                 syb
 version:              0.6
-x-revision: 1
+x-revision: 2
 license:              BSD3
 license-file:         LICENSE
 author:               Ralf Lammel, Simon Peyton Jones, Jose Pedro Magalhaes
                         , syb
                         , HUnit
                         , containers
-                        , mtl
+                        , mtl < 2.3