Lintian tag information: html-changelog-without-text-version (type: error)

Description (from lintian-explain-tags)

If the upstream changelog file is HTML formatted, a text version should
also be accessible as "changelog.gz". (This can be created by "lynx -dump
-nolist")

Please refer to Changelog files and release notes (Section 12.7) in the
Debian Policy Manual for details.

Visibility: error
Show-Always: no
Check: debian/changelog

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