private void Remove(string owner)
        {
            var matcher = new IssueMatcherConfig {
                Owner = owner
            };

            _onMatcherChanged(null, new MatcherChangedEventArgs(matcher));
        }
        private void Add(IssueMatcherConfig matcher)
        {
            var matchers = new IssueMatchersConfig
            {
                Matchers =
                {
                    matcher,
                },
            };

            matchers.Validate();
            _onMatcherChanged(null, new MatcherChangedEventArgs(matcher));
        }