Update Feature requests

Feature-requests.md

@@ -48,6 +48,7 @@
 | 046 | open | low | add waveform type Fill/Fill line |
 | 047 | open | low | add wf color current, line and max hold with same rgb values as rig |
 | 048 | open | low | filter overlay -- when FIL1/2/3 selection has been added in the UI |
+| 049 | open | low | Frequency lock checkbox. It is very easy to accidentally bump the scroll wheel and cause the radio to tune. |
 
 
 Notes: