Add docs for the `cachekey` output to the README #638

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Job	Run time
Rust 1.60 ubuntu-latest	1m 17s
Rust 1.60 windows-latest	1m 18s
Rust 1.60 macos-latest	1m 13s
Rust 1.66 ubuntu-latest	4m 33s
Rust 1.66 windows-latest	6m 29s
Rust 1.66 macos-latest	5m 52s
Rust nightly ubuntu-latest	24s
Rust nightly windows-latest	53s
Rust nightly macos-latest	36s
Rust beta ubuntu-latest	27s
Rust beta windows-latest	50s
Rust beta macos-latest	38s
Rust stable ubuntu-latest	25s
Rust stable windows-latest	1m 4s
Rust stable macos-latest	1m 10s
	27m 9s