Cabal revisions of colour-2.3.4

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

 Name:                colour Version:             2.3.4+x-revision:          1 Cabal-Version:       >= 1.10 License:             MIT License-file:        LICENSE  Library   default-language:  Haskell98-  Build-Depends:     base >= 4.9 && < 5+  Build-Depends:     base >= 4.9 && < 4.13   Exposed-Modules:   Data.Colour                      Data.Colour.SRGB                      Data.Colour.SRGB.Linear