Add information that PAT is needed

README.md

@@ -2,28 +2,28 @@
 This action deletes old versions of containers on Github container registry (ghcr.io). 
 By default only the latest version.
 
-This action works only with containers, no other package formats.
+This action works only for containers, no other package format.
 
+Since the [Github Token has no access to the container REST API](https://github.community/t/github-token-has-no-access-to-new-container-rest-apis/170395), a [PAT](https://docs.github.com/en/authentication/keeping-your-account-and-data-secure/creating-a-personal-access-token) with packages read- and write-permission is needed to access the packages. 
 ## Inputs
 ### `access-token`
-**Required** Access token with packages read- and write-permisson.
+**Required** Access token (PAT) with packages read- and write-permisson.
 ### `package-name`
 **Required** Name of the package to work with
-    required: true
 ### `versions-to-keep`
 How many versions should be left untouched. Default is '1', only the latest.
 ## Example usage
 ### Keep only the latest version:
 
-	uses: d22/cleanup-ghcr-containers-action@v0.3.0
+	uses: d22/cleanup-ghcr-containers-action@v0.3.3
 	with:
-      access-token: ${{ secrets.GITHUB_TOKEN }}
+      access-token: ${{ secrets.PERSONAL_ACCESS_TOKEN }}
       package-name: 'master-tool-dev'
 
 ### Keep the latest and the two following versions:
 
-	uses: d22/cleanup-ghcr-containers-action@v0.3.0
+	uses: d22/cleanup-ghcr-containers-action@v0.3.3
 	with:
-      access-token: ${{ secrets.MY_PAT }}
+      access-token: ${{ secrets.PERSONAL_ACCESS_TOKEN }}
       package-name: 'master-tool-dev'
       versions-to-keep: 3