Sending Files as Attachment on Notifications


It would be very great to have the possibility to attach at least one file to at least Email and Slack notifications.

For failing builds it could sometimes a bit pitiful to find out what went wrong. In some cases, like instrumentation tests there is a report-html sitting there which I would really like to attach to an email or slack notification

I know this can be implemented by uploading something to S3 etc. but it would be more helpful to have this as a ready to use feature in Travis