Incorporate Cargo Audit into CI #21

Job	Run time
Check (stable, ubuntu-latest)	16s
Check (stable, macOS-latest)	15s
Check (stable, windows-latest)	56s
Check (beta, ubuntu-latest)	14s
Check (beta, macOS-latest)	23s
Check (beta, windows-latest)	45s
Check (nightly, ubuntu-latest)	14s
Check (nightly, macOS-latest)	24s
Check (nightly, windows-latest)	39s
Test Suite (stable, ubuntu-latest)	17s
Clippy (stable)	11s
Test Suite (stable, macOS-latest)	18s
Clippy (beta)	17s
Test Suite (stable, windows-latest)	40s
Clippy (nightly)	18s
Test Suite (beta, ubuntu-latest)	19s
Test Suite (beta, macOS-latest)	26s
Test Suite (beta, windows-latest)	47s
Test Suite (nightly, ubuntu-latest)	19s
Test Suite (nightly, macOS-latest)	26s
Test Suite (nightly, windows-latest)	50s
	9m 14s

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