Build Package and Test Source Code [Python 3.6, 3.7, 3.8]

Use `load_defaults` rather than `missing` #17

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Run time

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Job	Run time
build (3.6)	1m 25s
build (3.7)	1m 24s
build (3.8)	1m 15s
build (3.9)	1m 11s
	5m 15s