optimize genSig by reusing zlib.Writer #13
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before: BenchmarkGenSig BenchmarkGenSig-16 7788 150884 ns/op 817750 B/op 62 allocs/op BenchmarkGenUserSigWithBuf BenchmarkGenUserSigWithBuf-16 7298 140476 ns/op 818145 B/op 68 allocs/op after: BenchmarkGenSig BenchmarkGenSig-16 39601 30510 ns/op 3896 B/op 42 allocs/op BenchmarkGenUserSigWithBuf BenchmarkGenUserSigWithBuf-16 38188 31464 ns/op 4064 B/op 48 allocs/op
before: BenchmarkGenSig BenchmarkGenSig-16 39601 30510 ns/op 3896 B/op 42 allocs/op BenchmarkGenUserSigWithBuf BenchmarkGenUserSigWithBuf-16 38188 31464 ns/op 4064 B/op 48 allocs/op after: BenchmarkGenSig BenchmarkGenSig-16 191563 6149 ns/op 4400 B/op 41 allocs/op BenchmarkGenUserSigWithBuf BenchmarkGenUserSigWithBuf-16 180298 6598 ns/op 4357 B/op 45 allocs/op
before: BenchmarkGenSig BenchmarkGenSig-16 191563 6149 ns/op 4400 B/op 41 allocs/op BenchmarkGenUserSigWithBuf BenchmarkGenUserSigWithBuf-16 180298 6598 ns/op 4357 B/op 45 allocs/op after: BenchmarkGenSig BenchmarkGenSig-16 394201 3111 ns/op 2131 B/op 19 allocs/op BenchmarkGenUserSigWithBuf BenchmarkGenUserSigWithBuf-16 372675 3170 ns/op 1866 B/op 22 allocs/op
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fix #12