Update README.md and increase PHPStan level to 3. (#112)

* Update README.md

* Increase phpstan level to 3

Author: richardbporter

README.md

@@ -4,8 +4,8 @@
 Drush commands to interact with multiple Drupal users.
 
 ## Requirements
-- Drush ^12.2
-- Drupal ^10.2
+- Drush ^12.2 || ^13.0
+- Drupal ^10.2 || ^11.0
 
 ## Installation
 Since this is a [site-wide Drush command](https://www.drush.org/latest/commands/#site-wide-commands), it will only be found when installed in certain directories. It is recommended to update your Composer installers path for drupal-drush packages to:

phpstan.neon

@@ -1,5 +1,7 @@
 parameters:
-    level: 1
+    level: 3
+    scanDirectories:
+        - vendor/drush/drush/src-symfony-compatibility
     ignoreErrors:
         - '#\Drupal calls should be avoided in classes, use dependency injection instead#'