Merge pull request #260 from danleh/readme-addendum #806

Job	Run time
Test Browser on macOS (safari, main)	1m 0s
Test Build	5m 54s
Test Browser on macOS (safari, disabled)	1m 34s
Test Browser on Linux (firefox, default)	2m 4s
Test Browser on Linux (firefox, disabled)	1m 22s
Test Browser on Linux (chrome, main)	30s
Test Browser on Linux (chrome, disabled)	1m 37s
Test Browser on Linux (firefox, main)	45s
Test Shell (jsc, default)	3m 5s
Test Shell (jsc, disabled)	1m 47s
Test Shell (spidermonkey, main)	59s
Test Browser on macOS (safari, default)	2m 0s
Test Shell (v8, main)	39s
Test Shell (spidermonkey, default)	5m 12s
Test Shell (v8, disabled)	1m 35s
Test Shell (jsc, main)	47s
Test Shell (v8, default)	2m 33s
Test Browser on Linux (chrome, default)	1m 3s
Test Shell (spidermonkey, disabled)	1m 55s
	36m 21s

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