delete method
Deletes flair for a Redditor.
redditor
can be either a String representing the Redditor's name or
an instance of Redditor.
Implementation
Future<void> delete(/* Redditor, String */ redditor) {
final redditorName = _redditorNameHelper(redditor);
return _subreddit.reddit.post(
apiPath['deleteflair']
.replaceAll(_kSubredditRegExp, _subreddit.displayName),
<String, String>{'api_type': 'json', 'name': redditorName});
}