Add ByteArrayOutputStream::reset #557

Job	Run time
rust_ci (macos-latest, beta)	1m 0s
rust_ci (macos-latest, nightly)	1m 25s
rust_ci (ubuntu-latest, nightly)	1m 30s
rust_ci (macos-latest, stable)	58s
rust_ci (windows-latest, beta)	1m 54s
rust_ci (ubuntu-latest, stable)	53s
rust_ci (windows-latest, nightly)	2m 58s
rust_ci (windows-latest, stable)	3m 7s
rust_ci (ubuntu-latest, beta)	56s
	14m 41s

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