Run of fresh-snapshots for rust-fern

Try this locally (using the package):

debcheckout rust-fern
cd rust-fern
DEB_UPDATE_CHANGELOG=auto new-upstream --snapshot --refresh-patches
1
gbp:error: Did not find debian/changelog or debian/source. Is this a Debian package?

Summary

Merged new upstream version: 0.5.8+git20200609.1.fab151f (was: 0.5.8).

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