[fix] Options were not passed correctly in example

The readme file said that `scrape()` methods could accept an array of arguments. This is not true anymore.

This change fixes this error and provides an example of how to set options on the scrapers.
[refactor] Improve K/CommitteeList scraper

Extract some methods, simplify code, remove some nesting, etc.
[doc] Document K/CommitteeList scraper in readme