fix readme typo for @zyxkad : md -> MD

MCDReforged / PluginCatalogue

The official MCDReforged plugin catalogue

https://mcdreforged.com/en/plugins

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Closed zyxkad closed 3 weeks ago

zyxkad commented 3 weeks ago

[x] 我已阅读并检查，此 PR 符合贡献指南中的要求 I have read and checked that my PR meets the requirements in the Contributing Guidelines