added version number, fixed infinite update loop

src/app.rs

@@ -517,6 +517,12 @@ impl App {
                                         .await
                                         {
                                             Ok(exe_path) => {
+                                                // Write expected version before exec so
+                                                // the next startup can detect a failed
+                                                // replacement (wrong asset, etc.).
+                                                updater::write_update_target(
+                                                    &info_clone.new_version,
+                                                );
                                                 let _ = tx2.send(Event::UpdateDone(exe_path));
                                             }
                                             Err(e) => {