Lintian tag information: changelog-file-not-compressed (type: error)

Description (from lintian-explain-tags)

Changelog files should be compressed using "gzip -9". Even if they start
out small, they will become large with time.

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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