fix default #19

Job	Run time
check std	19s
check serde	23s
check no-default-features	24s
docs	1m 9s
clippy	2m 18s
test stable --no-default-features	2m 19s
test no_std	33s
test stable	2m 15s
fmt	9s
test stable --features="all, scroll"	2m 24s
test stable --features="all, optimism"	2m 26s
test beta --no-default-features	2m 26s
test beta	2m 26s
test beta --features="all, scroll"	2m 29s
test beta --features="all, optimism"	2m 38s
test nightly --no-default-features	2m 11s
test nightly	2m 10s
test nightly --features="all, scroll"	2m 12s
test nightly --features="all, optimism"	2m 20s
	33m 31s

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