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formatting README.md #621

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Job	Run time
Build and test (gcc, 1)	1m 20s
Build and test (gcc, 2)	57s
Build and test (gcc, 3)	6m 16s
Build and test (gcc, 4)	6m 50s
Build and test (gcc, 5)	1m 28s
Build and test (gcc, 6)	1m 9s
Build and test (gcc, 7)	7m 53s
Build and test (gcc, 8)	8m 58s
Build and test (gcc, 9)	3m 6s
Build and test (gcc, 10)	4m 23s
Build and test (gcc, 11)	4m 30s
Build and test (gcc, 12)	1m 27s
Build and test (gcc, 13)	1m 26s
Build and test (gcc, 14)	1m 29s
Build and test (gcc, 15)	2m 40s
	53m 52s