Enhancements

• Extract stacktrace contents on errors wrapped by pkg/errors. #144

• Support modifying an individual event using a callback function argument.

  bugsnag.Notify(err, func(event *bugsnag.Event) {
    event.ErrorClass = "Unexpected Termination"
    event.MetaData.Update(loadJobData())
  
    if event.Stacktrace[0].File = "mylogger.go" {
      event.Stacktrace = event.Stacktrace[1:]
    }
  })

  The stack trace of an event is now mutable so frames can be removed or modified. #146

Bug fixes

• Send web framework name with severity reason if set. Previously this value was ignored, obscuring the severity reason for failed web requests captured by bugsnag middleware. #143