Lintian tag information: duplicate-changelog-files (type: warning)

Description (from lintian-explain-tags)

The package appears to be shipping two copies of the changelog.

If the second copy is really needed, consider making it a symlink to the
canonical place for the relevant changelog.

Both upstream and Debian changelogs are checked with this tag.

Visibility: warning
Show-Always: no
Check: files/duplicates

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