Add new label for stale issues and PRs (#178)

Update stale.yml

Author: patrickdappollonio

.github/workflows/stale.yml

@@ -15,4 +15,4 @@ jobs:
           close-issue-message: 'This issue was closed because it has been stalled for 5 days with no activity.'
           days-before-stale: 30
           days-before-close: 5
-          exempt-issue-labels: 'help wanted,automated,bug'
+          exempt-issue-labels: 'help wanted,automated,bug,no stale'