chore: fix typo on README.md #23

Job	Run time
doctest	26s
docs	22s
clippy	25s
cfg-check	19s
feature-checks	31s
fmt	14s
no-std	10s
wasm-unknown	15s
test ubuntu-latest stable --no-default-features	57s
test ubuntu-latest stable	17s
wasm-wasi	11s
test ubuntu-latest stable --all-features	30s
test ubuntu-latest nightly --no-default-features	20s
test ubuntu-latest nightly	17s
test ubuntu-latest nightly --all-features	40s
test ubuntu-latest 1.76 --no-default-features	21s
test ubuntu-latest 1.76	16s
test windows-latest stable --no-default-features	1m 16s
test windows-latest stable	48s
test windows-latest stable --all-features	1m 44s
test windows-latest nightly --no-default-features	43s
test windows-latest nightly	53s
test windows-latest nightly --all-features	1m 12s
test windows-latest 1.76 --no-default-features	31s
test windows-latest 1.76	42s
	14m 20s

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