docs: def get_urls(session, name, data, find_changelogs_fn, **kwargs):
      """
      Gets URLs to changelogs.
      :param session: requests Session instance
      :param name: str, package name
      :param data: dict, meta data
      :param find_changelogs_fn: function, find_changelogs
      :return: tuple, (set(changelog URLs), set(repo URLs))
      """
      # check if there's a changelog in ../custom/pypi/map.txt
      map = get_url_map()
      if name.lower().replace("_", "-") in map:
          logger.info("Package {name}'s URL is in pypi/map.txt, returning".format(name=name))
          return [map[name.lower().replace("_", "-")]], set()
      # if this package has valid meta data, build up a list of URL candidates we can possibly
      # search for changelogs on
      if "info" in data:
          # add all URLs in pypi's meta data:
          # {
          #   "info": {
          #       "home_page":
          #       "docs_url":
          #       "bugtrack_url":
          #   }
          # }
          candidates = [
              url for url in
              [data["info"].get(attr) for attr in ("home_page", "docs_url", "bugtrack_url")]
              if url
          ]
          # the latest release page on pypi might also contain links, add it
          candidates.append("https://pypi.python.org/pypi/{name}/{latest_release}".format(
              name=name,
              latest_release=next(iter(get_releases(data)))
          ))
          # Check the download URL as well.
          if "download_url" in data:
              candidates.append(data["download_url"])
          if data['info']['description']:
              candidates.extend(changelogs.url_re.findall(data["info"]["description"]))
          return find_changelogs_fn(session=session, name=name, candidates=candidates)
      return set(), set()