README.md: adjust the doc to avoid the hardcoded version #453

Job	Run time
cargo clippy -- -D warnings (ubuntu-latest)	13s
cargo check (ubuntu-latest)	10s
Code Coverage (ubuntu-latest, unix)	1m 34s
cargo check (macOS-latest)	24s
cargo clippy -- -D warnings (macOS-latest)	23s
Code Coverage (macos-latest, macos)	1m 53s
cargo check (windows-latest)	1m 5s
cargo clippy -- -D warnings (windows-latest)	1m 27s
Code Coverage (windows-latest, windows)	3m 15s
cargo fmt --all -- --check	4s
Run the fuzzers	2m 29s
cargo test (ubuntu-latest)	10s
cargo test (macOS-latest)	19s
cargo test (windows-latest)	1m 33s
	14m 59s

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