optOut method
Opt-out the current User to seeing the quarantined Subreddit.
When trying to request content from a quarantined subreddit, a
DRAWAuthenticationError
is thrown if the current User has not opted in
to see content from that subreddit.
Implementation
Future<void> optOut() async {
final data = {'sr_name': _subreddit.displayName};
await _subreddit.reddit
.post(apiPath['quarantine_opt_out'], data, discardResponse: true);
}