chore: fix ci issues (#22) #36

Job	Run time
check serde	50s
check std	47s
check no-default-features	49s
clippy	1m 35s
docs	1m 29s
fmt	11s
test stable --no-default-features	1m 14s
test stable	1m 11s
test stable --all-features	1m 40s
test beta --no-default-features	1m 5s
test beta	1m 5s
test beta --all-features	1m 28s
test nightly --no-default-features	2m 14s
test nightly	2m 21s
test nightly --all-features	2m 27s
	20m 26s

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