### Fixed

- **docs**: Incorrect formatting (#862)

### Changed

- **filter**: `LevelFilter` is now a re-export of the
  `tracing_core::LevelFilter` type, it can now be used interchangably
  with the versions in `tracing` and `tracing-core` (#853)
- **filter**: Significant performance improvements when comparing
  `LevelFilter`s  and `Level`s (#853)
- Updated the minimum `tracing-core` dependency to 0.1.12 (#853)

### Added

- **filter**: `LevelFilter` and `EnvFilter` now participate in
  `tracing-core`'s max level hinting, improving performance
  significantly in some use cases where levels are disabled globally
  (#853)

Signed-off-by: Eliza Weisman <eliza@buoyant.io>