Update README.md

Author: Christian Hughes

README.md

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+# Uplink
+
+Uplink is a MinecraftForge mod that adds Discord Rich Presence integration to Minecraft, to show your current username, server, and server player count!
+
+If you are not seeing anything, it's because Uplink is broken up by git branch.
+
+- [data branch](https://github.com/TheFrontier/Uplink/tree/data)
+- [1.7.10 branch](https://github.com/TheFrontier/Uplink/tree/mod-1.7)
+- [1.10.2 branch](https://github.com/TheFrontier/Uplink/tree/mod-1.10)
+- [1.12.2 branch](https://github.com/TheFrontier/Uplink/tree/mod-1.12)