minor correction for color changes in v2

See less/less-docs@3052f8b

CHANGELOG.md

@@ -6,7 +6,7 @@
    For a guide to breaking changes see [the v2 upgrade guide](http://lesscss.org/usage/#v2-upgrade-guide)
  - no longer including old versions of less in the repo or npm
  - not including test less and gradle files in npm
- - colours now output in the format they are added unless compressing, so yellow will output yellow, not its hex counterpart
+ - colours now output in the format they are added, so yellow will output yellow, not its hex counterpart
  - better parsing - better comment support and comments in brackets can now contain comments including quotes.
  - Removal of dependency on clean-css - install less-plugin-clean-css and use --clean-css to reference plugin
  - Environment Support - less is now separate from its node and browser environment implementations and adding support for another javascript environment should be straight forward.