Prepare 0.8.0 release #102

Job	Run time
fmt	14s
build (stable, --features "")	33s
clippy	48s
test	1m 49s
build (stable, --all-features)	2m 11s
build (stable, --no-default-features)	59s
build (1.71, --features "")	43s
build (1.71, --all-features)	1m 56s
build (1.71, --no-default-features)	30s
build (beta, --features "")	37s
build (beta, --all-features)	1m 44s
build (beta, --no-default-features)	36s
build (nightly, --features "")	35s
build (nightly, --all-features)	1m 46s
build (nightly, --no-default-features)	30s
	15m 31s

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