Update installation instructions #1727

Job	Run time
check	1m 8s
fuzz record_ref	6m 39s
fuzz select_query	7m 54s
cross x86_64-unknown-linux-gnu (stable)	1m 38s
cross x86_64-unknown-linux-gnu (beta)	1m 45s
cross x86_64-unknown-linux-gnu (nightly)	2m 10s
cross x86_64-unknown-linux-musl (stable)	1m 33s
cross aarch64-unknown-linux-gnu (stable)	1m 38s
cross aarch64-unknown-linux-musl (stable)	1m 47s
test x86_64-unknown-linux-gnu (stable)	2m 13s
test x86_64-unknown-linux-gnu (beta)	2m 6s
test x86_64-unknown-linux-gnu (nightly)	2m 26s
test x86_64-apple-darwin (stable)	3m 11s
test x86_64-apple-darwin (beta)	3m 19s
test x86_64-apple-darwin (nightly)	3m 18s
test x86_64-pc-windows-gnu (stable)	6m 17s
test i686-pc-windows-msvc (stable)	3m 49s
clippy	1m 11s
fmt	23s
deny	1m 25s
udeps	10m 23s
audit	0s
book	3m 7s
miri	2m 34s
upgrades	0s
gh-pages	0s
	1h 11m 54s

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