Update readme

Author: Peiyang-Song

README.md

@@ -61,7 +61,7 @@ moreLinkArgs = ["-L./.lake/packages/LeanCopilot/.lake/build/lib", "-lctranslate2
 require LeanCopilot from git "https://github.com/lean-dojo/LeanCopilot.git" @ "LEAN_COPILOT_VERSION"
 ```
 
-For stable Lean versions (e.g., `v4.28.0`), set `LEAN_COPILOT_VERSION` to be that version. For the latest unstable Lean versions (e.g., `v4.29.0-rc1`), set `LEAN_COPILOT_VERSION` to `main`. In either case, make sure the version is compatible with other dependencies such as mathlib. If your project uses lakefile.toml instead of lakefile.lean, it should include:
+For stable Lean versions (e.g., `v4.29.0`), set `LEAN_COPILOT_VERSION` to be that version. For the latest unstable Lean versions (e.g., `v4.30.0-rc1`), set `LEAN_COPILOT_VERSION` to `main`. In either case, make sure the version is compatible with other dependencies such as mathlib. If your project uses lakefile.toml instead of lakefile.lean, it should include:
 
 ```toml
 [[require]]