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Elapsed time in JSON output (#61) #73

Job	Run time
tests (windows-latest)	2m 4s
tests (macos-latest)	37s
tests (ubuntu-latest)	34s
build (windows, 386)	19s
build (windows, amd64)	19s
build (darwin, amd64)	26s
build (darwin, arm64)	18s
build (linux, 386)	17s
build (linux, amd64)	16s
build (linux, arm, 6)	17s
build (linux, arm64)	22s
build (linux, mips, softfloat)	21s
build (linux, mipsle, softfloat)	18s
build (freebsd, 386)	20s
build (freebsd, amd64)	26s
build (freebsd, arm, 6)	20s
build (freebsd, arm64)	19s
	7m 53s

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