message: remove mailto, because the github issue tracker is not a email address. Add matrix url
diff: @@ -36,6 +36,8 @@ const QString kIssueTracker =
  const QString kUrl =
  "https://stackoverflow.com/questions/tagged/gittyup?sort=frequent";
  +const QString kUrlMatrix = "https://matrix.to/#/#Gittyup:matrix.org";
  +
  const QString kSubtitleFmt = "<h4 style='margin-top: 0px; color: gray'>%2</h4>";
  const QString kTextFmt =
  @@ -45,7 +47,7 @@ const QString kTextFmt =
  "contributors</p><p> If you have a question that might benefit the "
  "community, consider asking it on <a href='%5'>Stack Overflow</a> by "
  "including 'gittyup' in the tags. Otherwise, contact us at "
  - "<a href='mailto:%6'>%6</a>";
  + "<a href='%6'>%6</a> or ask in the matrix channel: <a href='%7'>%7</a>";
  const QString kStyleSheet = "h3 {"
  " text-decoration: underline"
  @@ -87,7 +89,7 @@ AboutDialog::AboutDialog(QWidget *parent) : QDialog(parent) {
  QString date =
  dateTime.date().toString(QLocale().dateFormat(QLocale::LongFormat));
  QString text =
  - kTextFmt.arg(name, version, date, revision, kUrl, kIssueTracker);
  + kTextFmt.arg(name, version, date, revision, kUrl, kIssueTracker, kUrlMatrix);
  QLabel *label = new QLabel(text, this);
  label->setWordWrap(true);
  label->setTextInteractionFlags(kTextFlags);
  