Update stale.yml

Author: mmistakes

.github/stale.yml

@@ -8,7 +8,7 @@ exemptLabels:
 # Label to use when marking an issue as stale
 staleLabel: "Status: Stale"
 # Comment to post when marking an issue as stale. Set to `false` to disable
-markComment: >
+markComment: |
   This issue has been automatically marked as stale because it has not had
   recent activity.