modify setup to avoid post-processing numpy downgrade #26

Job	Run time
run_examples	6m 37s
run_unit_tests (main, no-extras)	2m 41s
run_unit_tests (stable, with-extras)	3m 28s
run_unit_tests (main, with-extras)	4m 33s
run_unit_tests (stable, no-extras)	1m 34s
	18m 53s

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