Update SECURITY.md

Add 3.x and expand disclaim dependency support requirements

Author: marzvrover

SECURITY.md

@@ -2,11 +2,14 @@
 
 ## Supported Versions
 
-| Version | Supported          |
-| ------- | ------------------ |
-| 2.x     | :white_check_mark: |
-| < 2.x   | :x:                |
+| Version | Supported                                  |
+| ------- | ------------------------------------------ |
+| 3.x     | :white_check_mark:                         |
+| 2.x     | :white_check_mark: [^swift-nio-disclaimer] |
+| < 2.x   | :x:                                        |
 
 ## Reporting a Vulnerability
 
 To report a secuirty issue please email me at [[email protected]](mailto:[email protected]?subject=Security%20Issue%20with%20github:swiftpackages/DotEnv)
+
+[^swift-nio-disclaimer]: Intented security patches for as long as [apple/swift-nio](https://github.com/apple/swift-nio) continues to provide patches. Their support can be found [within their repo](https://github.com/apple/swift-nio/blob/main/SECURITY.md#versions)