ristretto should investigate using the new go builtin hash functions

[Niko Schwarz]

The latest version of Go ships with a maphash package that's meant for exactly ristretto's kind of use case: https://golang.org/pkg/hash/maphash/. It's probably worth investigating if it can be used in order to get a speed boost.

[DisposaBoy]

FWIW: #160

[minhajs]

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