electron v1.0.0

Changelog:

• Bump version number to 1.0.0.
• Remove deprecated APIs. #5373

Migration notice:

• Please update your app to v0.37.8 first to check whether there are deprecated
  APIs usages.
• Following deprecated events of BrowserWindow have been removed but there
  were no deprecation warnings in previous versions, you should use the
  corresponding events in webContents instead:
  • crash
  • devtools-focused
  • devtools-opened
  • devtools-closed
• NativeImage.toDataUrl has been removed but there were no deprecation
  warnings in previous versions, you should use toDataURL instead.