Release: Update release notes

ReleaseNotes.md

@@ -1,6 +1,14 @@
 # Releases Notes
 These notes document what was removed from a Release Candidate (RC), which is build from a corresponding version of the program. These are not comulative between program versions (they can be between RCs), and express the diff from the master branch.
 
+## Droidplanner v2.4.2 RC1
+* On the DroneSetup pane removed the Tuning and Calibration Fragments
+* Removed unfinished/untested missionItems (Only Waypoint, Takeoff, Circle and Land are allowed)
+* Removed Failsafe warnings
+* Removed distance/time view at the editor screen
+* Removed un-finished buttons on the Circle mode fragment
+* Removed spline from the release
+
 ## Droidplanner v2.4.1 RC1
 * On the DroneSetup pane removed the Tuning and Calibration Fragments
 * Removed unfinished/untested missionItems (Only Waypoint, Takeoff, Circle and Land are allowed)