Fix broken dependency in colors.js

[spencer-robertson]

1.4.2 colors.js is broken, causing an infinte loop in the console (https://github.com/Marak/colors.js/issues/285). This fix just pins the colors version back to a stable build.

Relevant issues

Fixes #781

Contributor checklist

• [ ] Provide tests for the changes (unless documentation-only)
• [ ] Documented any new features, CLI switches, etc. (if applicable)
  • [ ] Server --help output
  • [ ] README.md
  • [ ] doc/http-server.1 (use the same format as other entries)
• [x] The pull request is being made against the master branch

Maintainer checklist

• [ ] Assign a version triage tag
• [ ] Approve tests if applicable

[zbynek]

Duplicate of #783 (and #785)

[thornjad]

Yeah duplicate of #783

[spencer-robertson]

My bad, cheers guys!