docs: add support for version 4 Filament Model States

Author: maartenpaauw

content/plugins/maartenpaauw-model-states.md

@@ -7,9 +7,11 @@ description: Seamlessly integrate model states and transitions into the Filament
 anystack_id: 9bce4c98-c0a7-4f66-b120-1ef2bdf5bf5f
 discord_url: https://discord.com/channels/883083792112300104/1229462868202881025
 github_repository: maartenpaauw/model-states-for-filament
-docs_url: https://raw.githubusercontent.com/maartenpaauw/model-states-for-filament-docs/main/README.md
+docs_urls:
+  v4: https://raw.githubusercontent.com/maartenpaauw/model-states-for-filament-docs/main/README.md
+  v3: https://raw.githubusercontent.com/maartenpaauw/model-states-for-filament-docs/refs/heads/3.x/README.md
 has_dark_theme: true
 has_translations: true
-versions: [3]
+versions: [3, 4]
 publish_date: 2024-04-15
 ---