fix: invalid signature error #85

Job	Run time
build (examples/ACUnit)	1m 58s
build (examples/AirQualitySensor/AirQualitySensor)	2m 14s
build (examples/Blinds)	2m 1s
build (examples/ContactSensor)	2m 16s
build (examples/DimSwitch)	1m 54s
build (examples/doorbell)	1m 52s
build (examples/Fan)	2m 0s
build (examples/GarageDoor)	1m 52s
build (examples/Light/Light)	2m 14s
build (examples/Lock/Lock)	2m 18s
build (examples/Lock/Lock_with_feedback)	2m 9s
build (examples/MotionSensor)	1m 55s
build (examples/PowerSensor)	2m 14s
build (examples/Relay/MultiRelays_advance)	1m 57s
build (examples/Relay/Relay)	1m 57s
build (examples/Speaker)	1m 52s
build (examples/Switch/MultiSwitch_advance)	2m 47s
build (examples/Switch/MultiSwitch_beginner)	2m 14s
build (examples/Switch/MultiSwitch_intermediate)	2m 9s
build (examples/Switch/Switch)	1m 53s
build (examples/Thermostat)	2m 16s
build (examples/TV)	1m 59s
build (examples/Health)	1m 52s
	47m 53s

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