Make our stalebot more relaxed

* Use newly added `stale` label for marking for auto-closing
* Ignore issues marked as bug or enhancement for stale marking
* Give more time for auto-closing of stale issue (30d instead of 7d)

.github/stale.yml

@@ -1,17 +1,19 @@
 # Number of days of inactivity before an issue becomes stale
 daysUntilStale: 60
 # Number of days of inactivity before a stale issue is closed
-daysUntilClose: 7
+daysUntilClose: 30
 # Issues with these labels will never be considered stale
 exemptLabels:
   - pinned
   - security
+  - bug
+  - enhancement
 # Label to use when marking an issue as stale
-staleLabel: wontfix
+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.
+  recent activity. It will be closed within a month 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: false