Cabal revisions of enumerator-0.4.20

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

 name: enumerator version: 0.4.20+x-revision: 1 license: MIT license-file: license.txt author: John Millikin <jmillikin@gmail.com>   hs-source-dirs: lib    build-depends:-      base >= 4.0 && < 5.0+      base >= 4.0 && < 4.11     , transformers >= 0.2     , bytestring >= 0.9     , containers >= 0.1