Update stalebot config (#538)

* Update stalebot config

Change stalebot to never mark issues as stale, and only close issues with no response. Also bugs should never be closed automatically.

* Update stale.yml

Only auto close issues and not pull requests

Author: Frank Mueller

.github/stale.yml

@@ -1,13 +1,10 @@
 # Number of days of inactivity before an issue becomes stale
-daysUntilStale: 30
+# Setting this to 100 years, because we do not want to automatically mark issues as stale
+daysUntilStale: 36500
 # Number of days of inactivity before a stale issue is closed
 daysUntilClose: 7
-# Issues with these labels will never be considered stale
-exemptLabels:
-  - investigating
-  - feature request
 # Label to use when marking an issue as stale
-staleLabel: wontfix-stale
+staleLabel: closing-soon-if-no-response
 # 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
@@ -17,3 +14,5 @@ markComment: >
 closeComment: >
   This issue has been automatically closed because of inactivity.
   Please open a new issue if are still encountering problems.
+# Limit to only `issues` or `pulls`
+only: issues