CI lints and tests

Adds codecov coverage result badge to README.md (#75) #140

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Run time

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Job	Run time
build-and-test (14)	13m 23s
build-and-test (15)	12m 22s
build-and-test (16)	12m 29s
build-and-test (17)	12m 8s
	50m 22s