Cabal revisions of pdf-toolbox-core-0.0.2.1

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

 name:                pdf-toolbox-core version:             0.0.2.1+x-revision: 1 synopsis:            A collection of tools for processing PDF files. license:             BSD3 license-file:        LICENSE                        bytestring,                        io-streams,                        attoparsec,-                       errors,+                       errors >=1.2 && <1.5,                        transformers,                        containers,                        zlib-bindings