git: contrib/zlib: Add upgrade notes to README

[Aaron LI]

commit 18f5982b088304a15b96028c1200486a9adb0404
Author: Aaron LI <aly at aaronly.me>
Date:   Wed Mar 19 13:37:18 2025 +0800

    contrib/zlib: Add upgrade notes to README

Summary of changes:
 contrib/zlib-1.2/README.DRAGONFLY | 9 +++++++++
 1 file changed, 9 insertions(+)

http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/18f5982b088304a15b96028c1200486a9adb0404


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