remove deprecated `js_notifier` for `airbrake`
remove deprecated `js_notifier` for `airbrake`

> [AIRBRAKE] config.js_notifier has been deprecated and has no effect.  You should use <%= airbrake_javascript_notifier %> directly at the top of your layouts.  Be sure to place it before all other javascript.

vilcabamba/bandango,vilcabamba/bandango