fix: call previous handler from non-notify release stages (#81)
fix: call previous handler from non-notify release stages (#81)

Added a check for shouldNotify before notifying Bugsnag of any uncaught error. 
This error was found using releaseStages, and running the app with a releaseStage 
that should not notify. Since it should not notify, the callback was never called. And 
with that, the previousHandler was never called.
bugsnag/bugsnag-react-native,bugsnag/bugsnag-react-native,bugsnag/bugsnag-react-native,bugsnag/bugsnag-react-native,bugsnag/bugsnag-react-native