Updated notifier documentation on manually sending notifications
Updated notifier documentation on manually sending notifications

nick-desteffen/airbrake,CarlosCD/airbrake,Shopify/airbrake,square/hoptoad_notifier,airbrake/airbrake,CarlosCD/airbrake,nick-desteffen/airbrake,benjaminoakes/airbrake,thoughtbot/hoptoad_notifier,airbrake/airbrake,stevecrozz/hydraulic_brake,kakra/hoptoad_notifier,thoughtbot/airbrake