Update Feature requests

Feature-requests.md

@@ -38,6 +38,7 @@
 | 036 | open | low | Add "reverse mouse scroll direction" UI element and preference |
 | 037 | open | low | Change Start/Stop WF buttons to a single checkbox to save UI space |
 | 038 | open | low | Add compatible rigctld server, can be connected to by gpredict and others without pseudo-term, might be a solution for windows as well. |
+| 039 | open | low | Scope reference level knob |
 
 Notes: