Add changelog link in program updater

Closes #8997.

src/gui/mainwindow.cpp

@@ -1833,9 +1833,11 @@ void MainWindow::handleUpdateCheckFinished(bool updateAvailable, QString newVers
 {
     QMessageBox::StandardButton answer = QMessageBox::Yes;
     if (updateAvailable) {
-        answer = QMessageBox::question(this, tr("qBittorrent Update Available"),
-                                       tr("A new version is available.\nDo you want to download %1?").arg(newVersion),
-                                       QMessageBox::Yes | QMessageBox::No, QMessageBox::Yes);
+        answer = QMessageBox::question(this, tr("qBittorrent Update Available")
+            , tr("A new version is available.") + "<br/>"
+                + tr("Do you want to download %1?").arg(newVersion) + "<br/><br/>"
+                + QString("<a href=\"https://www.qbittorrent.org/news.php\">%1</a>").arg(tr("Open changelog..."))
+            , QMessageBox::Yes | QMessageBox::No, QMessageBox::Yes);
         if (answer == QMessageBox::Yes) {
             // The user want to update, let's download the update
             ProgramUpdater *updater = dynamic_cast<ProgramUpdater * >(sender());