Update generated docs for 3.12.0

Author: ghes-bot

README.md

@@ -14,12 +14,19 @@ To install the latest version, use:
 gh extension install github.com/github/gh-es
 ```
 
-Please make sure to install the correct version of the CLI extension which matches the release version (e.g. `3.11`) of your GHES installation, by pinning to the latest patch for the corresponding release series:
+Please make sure to install the correct version of the CLI extension which matches the release version (e.g. `3.12.0`) of your GHES installation, by pinning to the latest patch for the corresponding release series:
 
 ```bash
-gh extension install github.com/github/gh-es --pin v3.11.0
+gh extension install github.com/github/gh-es --pin v3.12.0
 ```
 
+## Supported versions
+
+The following versions of GHES are supported by this CLI. Please refer to the [USAGE](./USAGE.md) for more information on how to use the CLI commands of each release.
+
+* [3.11](https://github.com/github/gh-es/blob/3.11/README.md)
+* [3.12](https://github.com/github/gh-es/blob/main/README.md)
+
 ## Usage
 
 For more information on how to use the CLI and its commands, please see the [USAGE](./USAGE.md) documentation.