electron Mac 打包，出现：cannot unpack

electron Mac 打包，出现：cannot unpack electron zip file, will be re-downloaded error=zip: not a valid zip file
等了许久也没下载成功：

  • downloading     url=https://npm.taobao.org/mirrors/electron/4.0.0/electron-v4.0.0-darwin-x64.zip size=55 MB parts=8
  • retrying        attempt=1
  • retrying        attempt=1
  • retrying        attempt=1
  • retrying        attempt=1
  • downloaded      url=https://npm.taobao.org/mirrors/electron/4.0.0/electron-v4.0.0-darwin-x64.zip duration=4m23.809s
  • cannot unpack electron zip file, will be re-downloaded  error=zip: not a valid zip file
  • downloading     url=https://npm.taobao.org/mirrors/electron/4.0.0/electron-v4.0.0-darwin-x64.zip size=55 MB parts=8

手动下载可以解决此问题：
先打开https://npm.taobao.org/mirrors/electron/4.0.0/ 网址，
再将mac上的zip包，和对应的SHASUMS256.txt文件都下载下来，放到本机的：
~/Library/Caches/electron目录下：

接着重新打包即可。