Ensure module_levels is always sorted #195

Job	Run time
rust-lint	13s
rust-test (ubuntu-latest, stable, colors)	15s
rust-test (ubuntu-latest, stable, threads)	14s
rust-test (ubuntu-latest, stable, timestamps)	14s
rust-test (ubuntu-latest, stable, stderr)	12s
rust-test (windows-latest, stable, colors)	47s
rust-test (windows-latest, stable, threads)	39s
rust-test (windows-latest, stable, timestamps)	44s
rust-test (windows-latest, stable, stderr)	44s
rust-test (macos-latest, stable, colors)	27s
rust-test (macos-latest, stable, threads)	25s
rust-test (macos-latest, stable, stderr)	26s
rust-test (ubuntu-latest, beta, colors,threads,timestamps)	16s
rust-test (ubuntu-latest, nightly, colors,threads,timestamps,nightly)	15s
rust-publish-crates	0s
	5m 51s

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