chore: release 0.3.0 #25

Job	Run time
clippy	14s
feature-checks	21s
docs	18s
fmt	14s
miri --no-default-features	33s
test stable --no-default-features	16s
miri	37s
test stable	11s
miri --all-features	47s
test stable --all-features	32s
test beta --no-default-features	25s
test beta	14s
test beta --all-features	33s
test nightly --no-default-features	18s
test nightly	16s
test nightly --all-features	32s
test 1.65 --no-default-features	15s
test 1.65	18s
test 1.65 --all-features	40s
	7m 34s

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