Update README.md - add note about mojibake

README.md

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 # Gazou-Channel-PHP-Archives
 Archives of the Gazou image BBS php software from http://php.s3.to/
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+Notes: [version 2.1](gazou-v2.1/) and [version 2.3](gazou-v2.3/) have a mojibake issue
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+If you are able to recover the information please open an issue/pr to fix it
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+Thanks!