Cabal revisions of colour-2.1.0

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

 Name:                colour Version:             2.1.0+x-revision: 1 Cabal-Version:       >= 1.2 License:             OtherLicense License-file:        LICENSE extra-source-files:  Tests.hs README  Library-  Build-Depends:     base+  Build-Depends:     base < 4.5   Exposed-Modules:   Data.Colour                      Data.Colour.SRGB                      Data.Colour.SRGB.Linear