SemVer Patch
- add flush api to default stdout/stderr logger (#87)
- Fix typo in LogHandler doc comment (#76)
- Link to ianpartridge/swift-log-syslog backend impl (#73)
- Fix documented ordering of Level (#78)
- Add Adorkable/swift-log-format-and-pipe to Backend list (#83)
- test formatting issues as part of sanity check (#84)
- better documentation around MetadataValue being expressible by literal
- Add HeliumLogger to README (#88)