update readme

Author: WindClan

README.md

@@ -14,7 +14,8 @@ The "Embedded Computer" mod is an addon for CC: Tweaked that adds the Embedded C
 
 
 - 1.20.1 is [0.X.X](https://github.com/WindClan/EmbeddedComputerMod/tree/1.20.1)
-- 1.21.1 is 1.X.X (you are here)
+- 1.21.1 is [1.X.X](https://github.com/WindClan/EmbeddedComputerMod/tree/1.21.1)
+- 1.21.7 is 2.X.X (you are here)
 
 ## Disclaimer