Check upate every day rather than every hour

lib/main-app.js

@@ -106,7 +106,7 @@ app.on('ready', function () {
   // Check update every hour
   setInterval(function () {
     checkUpdate()
-  }, 1000 * 60 * 60)
+  }, 1000 * 60 * 60 * 24)
 
   // Check update after 10 secs to prevent file locking of Windows
   setTimeout(() => {