Test

Add codecov badge to README #363

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Run time

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Job	Run time
Test coverage	2m 38s
Build and test (ubuntu-latest)	1m 16s
Build and test (macos-latest)	1m 38s
Build and test (ubuntu-latest)	1m 25s
Build and test (macos-latest)	1m 38s
Test coverage	2m 38s
	11m 13s