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tracing-core 0.1.3

Core primitives for application-level tracing.
Documentation 
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# 0.1.3 (August 8, 2019)

### Added

- `std::fmt::Display` implementation for `Level` (#194)
- `std::str::FromStr` implementation for `Level` (#195)

# 0.1.2 (July 10, 2019)

### Deprecated

- `Subscriber::drop_span` in favor of new `Subscriber::try_close` (#168)

### Added

- `Into<Option<&Id>>`, `Into<Option<Id>>`, and
  `Into<Option<&'static Metadata<'static>>>` impls for `span::Current` (#170)
- `Subscriber::try_close` method (#153)
- Improved documentation for `dispatcher` (#171)

# 0.1.1 (July 6, 2019)

### Added

- `Subscriber::current_span` API to return the current span (#148).
- `span::Current` type, representing the `Subscriber`'s view of the current
  span (#148).

### Fixed

- Typos and broken links in documentation (#123, #124, #128, #154)

# 0.1.0 (June 27, 2019)

- Initial release