build

Prepare 0.5.3 release #97

Job	Run time
test	1m 52s
clippy	46s
fmt	23s
build (stable, --features "")	1m 24s
build (stable, --all-features)	3m 2s
build (stable, --no-default-features)	1m 23s
build (1.75, --features "")	1m 28s
build (1.75, --all-features)	3m 20s
build (1.75, --no-default-features)	1m 34s
build (beta, --features "")	1m 24s
build (beta, --all-features)	3m 23s
build (beta, --no-default-features)	1m 30s
build (nightly, --features "")	1m 20s
build (nightly, --all-features)	2m 40s
build (nightly, --no-default-features)	1m 14s
	26m 43s

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