update: Simplified URL_REGEX

* The URL_REGEX got way more simple by using the one by @stephenhay from
  https://mathiasbynens.be/demo/url-regex

Signed-off-by: mr.Shu <mr@shu.io>
update: Fixed multiline url_matcher response

* Fixed states in which url_matcher would return two messages into a
  chatroom that doesn't properly handle newlines.

Signed-off-by: mr.Shu <mr@shu.io>