Use `--locked` in README.md #398

Job	Run time
Build Docker Image	31m 22s
macos	1m 2s
linux (x86_64-unknown-linux-musl, x86_64-musl)	51s
windows (x64, x86_64-pc-windows-msvc)	4m 17s
linux (i686-unknown-linux-musl, i686-musl)	1m 15s
windows (x86, i686-pc-windows-msvc)	5m 13s
linux (aarch64-unknown-linux-musl, aarch64-musl)	49s
linux (armv7-unknown-linux-musleabihf, armv7-musleabihf)	49s
linux (armv7-unknown-linux-musleabi, armv7-musleabi)	1m 17s
Release	0s
	46m 55s

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