refs #239 Fixes a bug which cannot open finder with using HotKey

lib/finder-app.js

@@ -5,6 +5,8 @@ app.on('ready', function () {
   if (process.platform === 'darwin') {
     app.dock.hide()
   }
+
+  finderWindow = require('./finder-window')
 })
 
 module.exports = app