Get list of Titles.

        Pass force=True to bypass the cache.

def get(self, force=False) -> 'List[Titles]':
        """Get list of Titles.

        Pass force=True to bypass the cache.
        """
        try:
            if force:
                raise CacheMissingError
            return self._cache.load()
        except CacheMissingError:
            titles = self._requester()
            self._cache.save(titles)
            return titles