Update README.md #84

Job	Run time
build (ubuntu-latest, Debug, gcc, 0)	12s
build (ubuntu-latest, Debug, gcc, 2)	20s
build (ubuntu-latest, Debug, clang, 0)	15s
build (ubuntu-latest, Debug, clang, 2)	34s
build (ubuntu-latest, Release, gcc, 0)	17s
build (ubuntu-latest, Release, gcc, 2)	22s
build (ubuntu-latest, Release, clang, 0)	26s
build (ubuntu-latest, Release, clang, 2)	22s
build (macos-latest, Debug, gcc, 0)	22s
build (macos-latest, Debug, gcc, 2)	28s
build (macos-latest, Debug, clang, 0)	19s
build (macos-latest, Debug, clang, 2)	19s
build (macos-latest, Release, gcc, 0)	27s
build (macos-latest, Release, gcc, 2)	22s
build (macos-latest, Release, clang, 0)	20s
build (macos-latest, Release, clang, 2)	25s
build (windows-latest, Debug, cl, 0)	1m 20s
build (windows-latest, Debug, cl, 2)	1m 4s
build (windows-latest, Release, cl, 0)	1m 5s
build (windows-latest, Release, cl, 2)	39s
	9m 58s

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