Bump version to 0.3.0-preview.2 #545

Job	Run time
build (windows-latest, Release)	3m 11s
build (ubuntu-latest, Debug)	2m 44s
build (ubuntu-latest, Release)	2m 46s
build (windows-latest, Debug)	3m 11s
build (macos-latest, Debug)	2m 15s
build (macos-latest, Release)	1m 25s
publish-coverage	0s
	15m 32s

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