Document / add example using github.com/rotisserie/eris

[rhcarvalho]

https://github.com/rotisserie/eris is an alternative to https://github.com/pkg/errors and https://github.com/golang/xerrors, should work out of the box with Sentry.

They have an example app to report errors with Sentry.

[github-actions[bot]]

This issue has gone three weeks without activity. In another week, I will close it.

But! If you comment or otherwise update it, I will reset the clock, and if you label it Status: Backlog or Status: In Progress, I will leave it alone ... forever!

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