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Prepare for 0.4.0 #198

Job	Run time
ci (1.70.0, macos-latest, false)	1m 12s
ci (1.70.0, windows-latest, false)	2m 16s
ci (stable, windows-latest, false)	2m 49s
ci (stable, ubuntu-latest, false)	1m 6s
ci (1.70.0, ubuntu-latest, false)	1m 23s
ci (nightly, ubuntu-latest, true)	1m 3s
ci (stable, macos-latest, false)	1m 10s
conclusion	4s
	11m 3s