Plane: update release notes for 4.1.0beta5

ArduPlane/release-notes.txt

@@ -1,3 +1,26 @@
+Release 4.1.0beta5 16th August 2021
+-----------------------------------
+
+This is a small beta update, with a few important fixes.
+
+Changes are:
+
+ - Flywoo F745 supports external I2C compasses
+ - GPS-for-yaw arming check added
+ - GPS_DRV_OPTIONS allows forcing UBlox GPS to 115200 baud
+ - Lua scripts can be placed in ROMFS_custom directory
+ - Q_P_VELXY_FILT renamed to _FLTE, Q_P_VELXY_D_FILT renamed to _FLTD
+ - CAN threading fix to resolve potential lockup when lua scripts use CAN
+ - EKF3 GSF can be invoked multiple times with source switching (no longer limited by EK3_GSF_RST_MAX)
+ - EKF3 IMU offset fix (vehicle's reported position was slightly incorrect if INS_POS_XYZ params set)
+ - OSD overwrite and nullptr check fix
+ - RCOut banner displayed at very end of startup procedure to avoid invalid output
+ - allow for VTOL flightmodes after AHRS fallback to DCM
+ - fixed a bug in Z accel initialisation (particularly affects tailsitters)
+ - added LOG_BITMASK bit for logging attitude and PIDs at full loop rate
+
+Happy flying!
+
 Release 4.1.0beta4 25th July 2021
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