Update README.md

Author: Juuxel

README.md

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 [>> Downloads <<](https://github.com/CottonMC/ClientCommands/releases)
 
+**Replaced by the client-sided command API in [Fabric Command API v1 1.1.0](https://github.com/FabricMC/fabric).**
+
 A Minecraft library for 1.14 to 1.16 that adds support for client-side commands.
 
 **This mod is open source and under a permissive license.** As such, it can be included in any modpack on any platform without prior permission. We appreciate hearing about people using our mods, but you do not need to ask to use them. See the [LICENSE file](LICENSE) for more details.