Copter: 3.6.4-rc1 release notes

ArduCopter/ReleaseNotes.txt

@@ -1,5 +1,16 @@
 ArduPilot Copter Release Notes:
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+Copter 3.6.4-rc1 20-Dec-2018
+Changes from 3.6.3
+1) Bug fixes and minor enhancements
+    a) Detect and clear stuck I2C bus when using ChibiOS
+    b) Pixhawk4 fix for battery monitor voltage scaling
+    c) TradHeli Dual (aka Chinook) fix for scaling of second swashplate movement
+    d) Omnibus F7 IMU orientation fix
+    e) Gimbal fix to avoid extreme movement if pilot's transmitter is off at startup 
+    f) Follow mode fix to obey FOLL_SYSID parameter (controls which vehicle to follow)
+2) Cheerson CX-OF optical flow sensor support
+------------------------------------------------------------------
 Copter 3.6.3 04-Dec-2018 / 3.6.3-rc1 01-Dec-2018
 Changes from 3.6.2
 1) Bug fixes and minor enhancements