Lintian tag information: format-3.0-but-debian-changes-patch (type: warning)

Description (from lintian-explain-tags)

This package declares source format 3.0 (quilt), but the Debian
.debian.tar.gz file contains a debian-changes-VERSION patch, which
represents direct changes to files outside of the debian directory. This
often indicates accidental changes that weren't meant to be in the package
or changes that were supposed to be separated out into a patch.

If this is intentional, you may wish to consider adding
single-debian-patch to debian/source/options, and/or a patch header to
debian/source/patch-header explaining why this is done.

Visibility: warning
Show-Always: no
Check: debian/patches/quilt

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