Deprecate electron-is-dev

[ghost]

Electron.js now has a built-in solution called app.isPackaged.
Run:

npm deprecate electron-is-dev "Use 'app.isPackaged' from electron.js instead of electron-is-dev"

[sindresorhus]

https://github.com/sindresorhus/electron-is-dev#how-is-this-different-than-appispackaged

[ghost]

Setting through an environment variable already can be done natively. process.env.APP_DEBUG === true || app.isPackaged. This package only occupies space and most people don't use it for the purpose it has nowadays.