Replaced makeSingleInstance method, deprecated

electron/main.js

@@ -312,7 +312,12 @@ ipcMain.on('relaunchApp', function(event) {
 	app.exit(0);
 });
 
-const shouldQuit = app.makeSingleInstance((commandLine, workingDirectory) => {
+const shouldQuit = app.requestSingleInstanceLock() 
+if (!shouldQuit) {
+	app.quit();
+	return;
+}
+app.on('second-instance', (event, commandLine, workingDirectory) => {
 	// Someone tried to run a second instance, we should focus our window.
  if (mainWindow) {
 	 if (mainWindow.isMinimized()) mainWindow.restore();
@@ -323,10 +328,6 @@ const shouldQuit = app.makeSingleInstance((commandLine, workingDirectory) => {
  }
 });
 
-if (shouldQuit) {
-	app.quit();
-	return;
-}
 
 // Code for downloading images as temporal files
 // Credit: Ghetto Skype (https://github.com/stanfieldr/ghetto-skype)