update stale bot config

.github/stale.yml

@@ -1,17 +1,19 @@
 # Number of days of inactivity before an issue becomes stale
-daysUntilStale: 7
+daysUntilStale: 4
 # Number of days of inactivity before a stale issue is closed
-daysUntilClose: 7
+daysUntilClose: 4
 # Issues with these labels will never be considered stale
 exemptLabels:
   - pinned
   - security
 # Label to use when marking an issue as stale
-staleLabel: 
+staleLabel: stale
 # Comment to post when marking an issue as stale. Set to `false` to disable
 markComment: >
   This issue has been automatically marked as stale because it has not had
   recent activity. It will be closed if no further activity occurs. Thank you
   for your contributions.
 # Comment to post when closing a stale issue. Set to `false` to disable
-closeComment: false
+closeComment: >
+  Closing the issue, since no updates observed.
+  Feel free to re-open if you need any further assistance.