Returns the locations that Twitter has trending topic information for.
The response is an array of "locations" that encode the location's WOEID and some other human-readable information such as a canonical name and country the location belongs in.
A WOEID is a Yahoo! Where On Earth ID.
use Widop\Twitter\Rest\Trends\TrendsAvailableRequest;
$trends = $twitter->send($new TrendsAvailableRequest());