Plane: updated release notes for 4.1.0beta3

ArduPlane/release-notes.txt

@@ -1,3 +1,35 @@
+Release 4.1.0beta3 5th July 2021
+--------------------------------
+
+This is a minor update over the 4.0.1beta2 release. It has a few
+important fixes for beta testers:
+
+ - sync with copter 4.1.0beta5
+
+ - added QRTL always option in Q_RTL_MODE
+
+ - added more modes to USE_REV_THRUST parameter
+
+ - added QioTekZealonH743 board type
+
+ - added EKF3 protections for variance collapse
+
+ - added PiccoloCAN servo support
+
+ - improved VTOL position control a long distance from home
+
+ - fixed handling of 180 degree longitude date-line crossing
+
+ - fixed logged after forced arm
+
+ - fixed DShot with quadplane motor test
+
+ - adjusted autotune handling of target filter
+
+ - adjusted default roll/pitch PID filters
+
+Please report all test results, and happy flying!
+
 Release 4.1.0beta2 24th June 2021
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