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change some things I noticed while following this readme step-by-step #121

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Job	Run time
ubuntu-20-04-build-gcc	4m 59s
macos-latest-build	8m 32s
macos-13-build	5m 34s
ubuntu-20-04-build-clang	4m 50s
ubuntu-latest-build-clang	3m 48s
ubuntu-latest-build-gcc	3m 35s
	31m 18s