List electron-prebuilt as dev dependency
List electron-prebuilt as dev dependency

Additionally, state license and repository location
in package.json.

fernandoviton/view-slack-js,b52/electron-es6-react,davidmfigueroa/Teks,fernandoviton/view-slack-js,fernandoviton/view-slack-js,davidmfigueroa/Teks,b52/electron-es6-react