Add transitional message #623

Job	Run time
lint	2m 3s
build (ubuntu-latest, afl, stable, cc)	5m 55s
build (ubuntu-latest, afl, stable, clang)	5m 14s
build (ubuntu-latest, afl, nightly, cc)	5m 45s
build (ubuntu-latest, afl, nightly, clang)	5m 17s
build (ubuntu-latest, cargo-afl, stable, cc)	8m 37s
build (ubuntu-latest, cargo-afl, stable, clang)	7m 5s
build (ubuntu-latest, cargo-afl, nightly, cc)	5m 34s
build (ubuntu-latest, cargo-afl, nightly, clang)	5m 41s
build (macos-latest, afl, stable, cc)	7m 28s
build (macos-latest, afl, stable, clang)	10m 55s
build (macos-latest, afl, nightly, cc)	11m 5s
build (macos-latest, afl, nightly, clang)	9m 25s
build (macos-latest, cargo-afl, stable, cc)	8m 22s
build (macos-latest, cargo-afl, stable, clang)	9m 36s
build (macos-latest, cargo-afl, nightly, cc)	10m 59s
build (macos-latest, cargo-afl, nightly, clang)	10m 33s
all-checks	1s
	2h 9m 35s

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