Update README.md

Author: alies-dev

README.md

@@ -38,6 +38,8 @@ Maintained versions:
 | 3.x                  | ^8.2  | 11, 12    | 6, 7  |
 | 2.12+                | ^8.0  | 9, 10, 11 | 5, 6  |
 
+_(Older versions of Laravel, PHP, and Psalm were supported by version 1.x of the plugin, but they are no longer maintained)_
+
 
 See [releases](https://github.com/psalm/psalm-plugin-laravel/releases) for more details about supported PHP, Laravel and Psalm versions.