Relay needs:

• hiredis >= 1.1.0
• openssl >= 1.1.0
• ck >= 0.7.0

Let's start referring to relay.so in:

• relay-docs
• Linux repos (when possible)
• Docker examples
• macOS (x86) homebrew tap

macOS (arm64) needs to keep using needs to keep using it, because the ARM edition needs an unreleased concurrencykit version. cachewerk/homebrew-tap#2