Cabal revisions of errors-2.1.2

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

 Name: errors Version: 2.1.2+x-revision: 1 Cabal-Version: >=1.8.0.2 Build-Type: Simple License: BSD3  Library     Build-Depends:-        base                >= 4     && < 5  ,+        base                >= 4     && < 4.11  ,         safe                >= 0.3.3 && < 0.4,         transformers        >= 0.2   && < 0.6,         transformers-compat >= 0.4   && < 0.6,