Exempt issues that have an assignee or milestone

Author: asbjornu

.github/stale.yml

@@ -1,18 +1,29 @@
 # Number of days of inactivity before an issue becomes stale
 daysUntilStale: 90
+
 # Number of days of inactivity before a stale issue is closed
 daysUntilClose: 30
+
 # Issues with these labels will never be considered stale
 exemptLabels:
   - pinned
   - security
   - bug
+
+# Set to true to ignore issues in a milestone (defaults to false)
+exemptMilestones: true
+
+# Set to true to ignore issues with an assignee (defaults to false)
+exemptAssignees: true
+
 # Label to use when marking an issue as stale
 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. After 30 days from now, 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