v0.6.0

• Pause playback when entering sleep #314
• add always-on-top view menu item #313
• update deps
  • "electron-context-menu": "^0.10.0",
  • "electron-updater": "3.0.3",
  • "music-metadata": "^2.4.2",
  • "through2-filter": "^3.0.0",
  • "electron": "2.0.6",
  • "electron-builder": "20.26.1",