Flush issues on panic or fatal level

[mikluke]

Now such code will send issue

hook, err := sentry.NewHook(sentry.Options{
	Dsn:              opts.SentryDSN,
	AttachStacktrace: true,
	Release:          health.GetVersion(),
}, logrus.PanicLevel, logrus.FatalLevel, logrus.ErrorLevel)

if err != nil {
	logrus.WithError(err).Fatal("failed to init sentry")
}

logrus.AddHook(hook)

logrus.WithError(errors.New("test")).Fatal("test")

[onrik]

Why?

[mikluke]

I've started using. I'll recreate pull request without this commit

[mikluke]

#20