Logging with --no-color outputting objects

colors.js hasn't been updated in npm for a long time but it's being updated on Github.

The issue here was that when logging from Attester with `--no-color` passed in command line, it sometimes logged the String object (`console.dir` fashion) instead of a logging a string literal (precisely it was fixed by https://github.com/Marak/colors.js/commit/5ca667df4a9f86f6c202eca5eb1524cd8d2dd331).