fix typo #754

Job	Run time
rustfmt	11s
Test stable ubuntu-latest --no-default-features	1m 36s
Test stable ubuntu-latest	1m 54s
Test stable ubuntu-latest --all-features	2m 0s
Test stable macos-latest --no-default-features	3m 37s
Test stable macos-latest	5m 59s
Test stable macos-latest --all-features	2m 59s
Test stable windows-latest --no-default-features	4m 6s
Test stable windows-latest	4m 32s
Test stable windows-latest --all-features	5m 9s
Test beta ubuntu-latest --all-features	2m 11s
Test nightly ubuntu-latest --all-features	2m 2s
Release x86_64-unknown-linux-gnu	1m 3s
Release aarch64-unknown-linux-gnu	1m 16s
Release armv7-unknown-linux-gnueabihf	1m 23s
Release arm-unknown-linux-gnueabihf	1m 12s
Release riscv64gc-unknown-linux-gnu	1m 16s
Release x86_64-apple-darwin	2m 30s
Release aarch64-apple-darwin	1m 34s
Release x86_64-pc-windows-msvc	2m 22s
Release aarch64-pc-windows-msvc	2m 40s
	51m 32s

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