Fix update error

This error was caused by using super old version of
electron-winstaller.

lib/main-app.js

@@ -65,14 +65,6 @@ updater.autoUpdater.on('error', (err) => {
   console.log(err)
 })
 
-ipc.on('update-check', function (event, msg) {
-  if (isUpdateReady) {
-    mainWindow.webContents.send('update-ready', 'Update available!')
-  } else {
-    checkUpdate()
-  }
-})
-
 ipc.on('update-app-confirm', function (event, msg) {
   if (isUpdateReady) {
     mainWindow.removeAllListeners()
@@ -116,7 +108,18 @@ app.on('ready', function () {
     checkUpdate()
   }, 1000 * 60 * 60)
 
-  checkUpdate()
+  // Check update after 10 secs to prevent file locking of Windows
+  setTimeout(() => {
+    checkUpdate()
+
+    ipc.on('update-check', function (event, msg) {
+      if (isUpdateReady) {
+        mainWindow.webContents.send('update-ready', 'Update available!')
+      } else {
+        checkUpdate()
+      }
+    })
+  }, 10000)
   ipcServer = require('./ipcServer')
   ipcServer.server.start()
 })