Release `v0.3.0` #315

Job	Run time
ubuntu-apt (3.8, ubuntu-20.04)	31s
ubuntu-apt (3.8, ubuntu-22.04)	35s
ubuntu-apt (3.11, ubuntu-20.04)	34s
multi-conda (3.8, macos-12)	1m 25s
ubuntu-postgres-action (3.9, testpw)	33s
pre-commit	28s
ubuntu-apt (3.11, ubuntu-22.04)	41s
multi-conda (3.8, windows-2022)	2m 44s
ubuntu-postgres-service (3.9, testpw)	43s
	8m 14s

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