Rename `Error` type #470

Job	Run time
build (macOS-latest, stable)	8m 0s
build-windows	17m 3s
build (ubuntu-latest, stable)	8m 46s
Clippy	30s
build (ubuntu-latest, beta)	9m 19s
build (ubuntu-latest, nightly)	8m 8s
Measure coverage	7m 46s
build (ubuntu-latest, stable 7 months ago)	13m 42s
Documentation (stable)	51s
Format	7s
Documentation (beta)	53s
Documentation (nightly)	42s
Documentation (stable 7 months ago)	4m 17s
	1h 20m 4s

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