Run Github CI tests.

update README.md and version strings #620

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Job	Run time
Build and test (gcc, 1)	1m 9s
Build and test (gcc, 2)	1m 4s
Build and test (gcc, 3)	6m 34s
Build and test (gcc, 4)	6m 26s
Build and test (gcc, 5)	1m 9s
Build and test (gcc, 6)	1m 1s
Build and test (gcc, 7)	8m 25s
Build and test (gcc, 8)	8m 10s
Build and test (gcc, 9)	3m 21s
Build and test (gcc, 10)	4m 6s
Build and test (gcc, 11)	4m 15s
Build and test (gcc, 12)	1m 19s
Build and test (gcc, 13)	1m 27s
Build and test (gcc, 14)	1m 21s
Build and test (gcc, 15)	2m 32s
	52m 19s