Bump version to 0.2.0-preview.4 #410

Job	Run time
build (ubuntu-latest, Release)	2m 36s
build (ubuntu-latest, Debug)	2m 28s
build (windows-latest, Debug)	6m 1s
build (windows-latest, Release)	5m 0s
build (macos-latest, Release)	1m 51s
build (macos-latest, Debug)	6h 0m 20s
publish-coverage	0s
	6h 18m 16s

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