refactor(color-eyre): improve filter example and code readability #489

Job	Run time
Test Suite	3m 31s
Test Suite (--no-default-features)	3m 25s
Test Suite (--no-default-features --features track-caller)	3m 28s
Test Suite (--no-default-features --features auto-install)	3m 25s
Rustfmt (stable)	9s
Check (stable)	17s
Test Suite (stable)	1m 18s
Test Suite (ubuntu-latest)	1m 8s
Test Suite (stable, --no-default-features)	1m 0s
Clippy (stable)	29s
Test Suite (windows-latest)	2m 2s
Test Suite (stable, --no-default-features --features track-caller)	1m 3s
Test Suite (macOS-latest)	1m 9s
Test Suite (stable, --no-default-features --features auto-install)	1m 15s
Test Suite (stable, --features pyo3)	1m 14s
Miri	1m 22s
Test Suite (stable, --all-features)	1m 15s
Test Suite (beta)	1m 6s
Test Suite (beta, --no-default-features)	1m 2s
Test Suite (beta, --no-default-features --features track-caller)	1m 3s
Test Suite (beta, --no-default-features --features auto-install)	1m 1s
Test Suite (beta, --features pyo3)	1m 10s
Test Suite (beta, --all-features)	1m 15s
Test Suite (nightly)	1m 6s
Test Suite (nightly, --no-default-features)	1m 2s
Test Suite (nightly, --no-default-features --features track-caller)	1m 2s
Test Suite (nightly, --no-default-features --features auto-install)	1m 9s
Test Suite (nightly, --features pyo3)	1m 5s
Test Suite (nightly, --all-features)	1m 11s
	40m 42s

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