Fixture Status filter for /leagues/active.

To help transition from v2, we are adding a new query param to the /leagues/active endpoint to allow for you to get leagues that have fixtures with a given status. This will be useful if you want to get all active leagues that have games that live.

To achieve the same functionality as v2/leagues?is_live=1 , you can do v3/leagues/active?fixture_status=Live.