Provide darwin/arm64 (Apple Silicon) builds

[radeksimko]

Current Version

0.11.0

Use-cases

Users with new Apple MacBooks released in late 2020 would benefit from binaries which can run natively on that machine.

Existing Solution

Use darwin/amd64 via Rosetta.

Proposal

Add darwin/arm64 binaries as a build target into GoRelaser config.

Depends on goreleaser/goreleaser#1956

[ghost]

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