Update README.md

Author: OllieMartin

.github/README.md

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 # Development
 Welcome to the public code repository for MultiChat by Revilo410. (Oliver Martin)
 
-MultiChat is an advanced chat management system for Spigot/Bungeecord with over **15000** downloads.
+MultiChat is an advanced chat management system for Spigot/Bungeecord with over **20000** downloads.
 
 [Official Listing](https://www.spigotmc.org/resources/multichat.26204/)