fix gem unpack line for 1.2.6
fix gem unpack line for 1.2.6

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