Update SECURITY.md with version support details

Added version support tables for react-docgen and @react-docgen/cli.

Author: danez

SECURITY.md

@@ -10,6 +10,8 @@ We patch bugs and security relevant issues in the latest version and recommend u
 
 We will backport security fixes if needed to the last 4 previous major versions.
 
+### react-docgen
+
 | Version | Supported          |
 | ------- | ------------------ |
 | [v8](https://github.com/reactjs/react-docgen/releases) | :white_check_mark: |
@@ -19,6 +21,14 @@ We will backport security fixes if needed to the last 4 previous major versions.
 | [v4](https://github.com/reactjs/react-docgen/releases) | :white_check_mark: |
 | v3 or older   | :x:                |
 
+### @react-docgen/cli
+
+| Version | Supported          |
+| ------- | ------------------ |
+| [v3](https://github.com/reactjs/react-docgen/releases) | :white_check_mark: |
+| [v2](https://github.com/reactjs/react-docgen/releases) | :white_check_mark: |
+| [v1](https://github.com/reactjs/react-docgen/releases) | :white_check_mark: |
+
 ## Reporting a Vulnerability
 
 Security vulnerabilities should be reported by drafting a [Security Advisory](https://github.com/reactjs/react-docgen/security/advisories/new) directly on github or through [Tidelift](https://tidelift.com/docs/security).