add missing inputs to action.yml closes #551 (#554)

action.yml

@@ -168,6 +168,14 @@ inputs:
     description: 'Display some statistics at the end regarding the stale workflow (only when the logs are enabled).'
     default: 'true'
     required: false
+  labels-to-add-when-unstale:
+    description: 'A comma delimited list of labels to add when a stale issue or pull request receives activity and has the stale-issue-label or stale-pr-label removed from it.'
+    default: ''
+    required: false
+  labels-to-remove-when-unstale:
+    description: 'A comma delimited list of labels to remove when a stale issue or pull request receives activity and has the stale-issue-label or stale-pr-label removed from it.'
+    default: ''
+    required: false
 outputs:
   closed-issues-prs:
     description: 'List of all closed issues and pull requests.'