Plane: release notes for 4.5.0 #227

Job	Run time
build (base)	6m 41s
build (clang)	8m 51s
build-gcc-heli	6m 37s
autotest-heli (sitltest-heli)	11m 21s
autotest (sitltest-copter-tests1a)	12m 6s
autotest (sitltest-copter-tests1b)	13m 22s
autotest (sitltest-copter-tests1c)	12m 5s
autotest (sitltest-copter-tests1d)	11m 35s
autotest (sitltest-copter-tests1e)	13m 41s
autotest (sitltest-copter-tests2a)	12m 52s
autotest (sitltest-copter-tests2b)	25m 4s
	2h 14m 15s

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