readability
                                
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                        Add candidateFilters option
@luin @haroldtreen Please help review, and give some suggestions, thanks.
This looks like an interesting option @hankliu62 👍 . What do you think about calling it candidateFilters? Filters just accept a single candidate, so it makes a bit more sense to me.
Curious if @luin has thoughts because I know less about the history of this module 😅 .
@haroldtreen, thanks for all your help! I've updated PR according to your instructions. Let me know if I've missed something.
Thanks for the updates @hankliu62 !
Only last thing I would consider is bumping the version in package.json to 3.1.0 to indicate a new feature has been added. Also note the new feature in CHANGELOG.md.