Update CHANGELOG.md

Author: juliusmusseau

CHANGELOG.md

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+## v2021.12.16
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+- Properly detect exploded Log4J versions (that are not inside *.jar and instead are just sitting as *.class directly on disk).
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+- Fixed problem that was causing some inner-jar entries to be misread. ("Unexpected end of ZLIB stream").
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+- All problems now printed on STDERR instead of STDOUT.
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+- Only check read-permission on files we're interested in (makes for a lot fewer "cannot read!" errors).
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