tag v0.6.1 differs from content at go module proxy

[MichaelEischer]

As discovered in restic/restic#5154 the official go mod proxy returns a slightly different repository content (just an extra CHANGELOG.md) compared to what is currently referenced by tag v0.6.1.

The tag currently points at e00c584, but based on a comparison with the data cached at the go mod proxy it was original created from efa10c0 . Judging from the contained changelog, the latter commit is also the one that was intended to be tagged as v0.6.1.

Is there a reason why the tag was moved? And can it be returned to the original commit?