docs: add a note to set destinations part in readme (#458) #80

Job	Run time
build-and-test / lint	1m 30s
build-and-test / test	2s
build-and-test / check-java-formatting	11s
build-and-test / build-android	9m 59s
build-and-test / build-library	1m 30s
build-and-test / build-ios	11m 26s
build-and-test / check-objc-formatting	17s
release-please	12s
publish	0s
	25m 7s

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