Do not display logs with colorguard.process()

[regseb]

Hello,

When the API colorguard.process() is called, the results are returned in the promise, but they are also displayed on the standard output:

<input css 1>
  line 5  col 5  #fffffe collides with #ffffff  (2:11)

  ✖  1 collision found.

These messages pollute the console when Colorguard is used by program. The process() method should not write to the console (or add an option to disable it).