v1.18.0

Changelog

• 795e8d5 fix arm64/v8 docker build
• 6465696 Redis cache fix (#244)
• 3830981 consolidate builds
• 72512ec add darwin builds + disable cgo
• 7802e90 add darwin build
• f8f3e83 Move from github.com/DataDog/zstd to github.com/klauspost/compress/zstd (#238)
• 2c10fb7 add testdata/http.metrics.namespace.yml
• dbb4d1b add namespace option in Server struct
• 9dcb68e support metric namespace
• 893ece8 Update TTL of transactions upon finalisation to 500 ms (#235)
• 3326055 simplify heartbeat code (#234)
• 701988a Wildcarded users (#219)