Move electron back to devDependencies
Move electron back to devDependencies

This appears to be necessary to fix our build tooling, and matches what
hyper and WebTorrent do.

keybase/client,keybase/client,keybase/client,keybase/client,keybase/client,keybase/client,keybase/client,keybase/client,keybase/client,keybase/client,keybase/client,keybase/client