Commits on Oct 22, 2021

1. subscriber: prepare to release v0.3.0 …

   # 0.3.0 (Oct 22, 2021)
   
   This is a breaking release of `tracing-subscriber`. The primary breaking
   change in this release is the removal of the dependency on the [`chrono`
   crate], due to [RUSTSEC-2020-0159]. To replace `chrono`, support is
   added for formatting timestamps using the [`time` crate] instead.
   
   In addition, this release includes a number of other breaking API
   changes, such as adding (limited) support for `#![no_std]` targets,
   removing previously deprecated APIs, and more.
   
   ### Breaking Changes
   
   - Removed APIs deprecated in the v0.2.x release series.
   - Renamed `Layer::new_span` to `Layer::on_new_span` ([#1674])
   - Removed `Layer` impl for `Arc<L: Layer<S>>` and `Arc<dyn Layer<S> +
     ...>` ([#1649])
   - Replaced the [`chrono` crate] with the [`time` crate] for timestamp
     formatting, to resolve [RUSTSEC-2020-0159] ([#1646])
   - Removed `json` and `env-filter` from default features. They must now
     be enabled explictly ([#1647])
   - Changed `FormatEvent::format_event` and `FormatFields::format_fields`
     trait methods to take a `Writer` type, rather than a `&mut dyn
     fmt::Write` trait object ([#1661])
   - Changed the signature of the `MakeWriter` trait by adding a lifetime
     parameter ([#781])
     ### Changed
   
   - **layer**: Renamed `Layer::new_span` to `Layer::on_new_span` ([#1674])
   - **fmt**: Changed `FormatEvent::format_event` and
     `FormatFields::format_fields` trait methods to take a `Writer` type,
     rather than a `&mut dyn fmt::Write` trait object ([#1661])
   - **json**, **env-filter**: `json` and `env-filter` feature flags are no
     longer enabled by default ([#1647])
     ### Removed
   
   - Removed deprecated `CurrentSpan` type ([#1320])
   - **registry**: Removed deprecated `SpanRef::parents` iterator, replaced
     by `SpanRef::scope` in [#1431] ([#1648)])
   - **layer**: Removed deprecated `Context::scope` iterator, replaced by
     `Context::span_scope` and `Context::event_scope` in [#1431] and
     [#1434] ([#1648)])
   - **layer**: Removed `Layer` impl for `Arc<L: Layer<S>>` and `Arc<dyn
     Layer<S> + ...>`. These interfere with per-layer filtering. ([#1649])
   - **fmt**: Removed deprecated `LayerBuilder` type ([#1673])
   - **fmt**: Removed `fmt::Layer::on_event` (renamed to
     `fmt::Layer::fmt_event`) ([#1673])
   - **fmt**, **chrono**: Removed the `chrono` feature flag and APIs for
     using the [`chrono` crate] for timestamp formatting ([#1646])
     ### Added
   
   - **fmt**, **time**: `LocalTime` and `UtcTime` types for formatting
     timestamps using the [`time` crate] ([#1646])
   - **fmt**: Added a lifetime parameter to the `MakeWriter` trait,
     allowing it to return a borrowed writer. This enables implementations
     of `MakeWriter` for types such as `Mutex<T: io::Write>` and
     `std::fs::File`. ([#781])
   - **env-filter**: Documentation improvements ([#1637])
   - Support for some APIs on `#![no_std]` targets, by disabling the `std`
     feature flag ([#1660])
   
   Thanks to @Folyd and @nmathewson for contributing to this release!
   
   [#1320]: #1320
   [#1673]: #1673
   [#1674]: #1674
   [#1646]: #1646
   [#1647]: #1647
   [#1648]: #1648
   [#1649]: #1649
   [#1660]: #1660
   [#1661]: #1661
   [#1431]: #1431
   [#1434]: #1434
   [#781]: #781
   
   [`chrono` crate]: https://crates.io/crates/chrono
   [`time` crate]: https://crates.io/crates/time
   [RUSTSEC-2020-0159]: https://rustsec.org/advisories/RUSTSEC-2020-0159.html

   

   hawkw committed Oct 22, 2021
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2. update dependencies and docs …

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

   

   hawkw committed Oct 22, 2021
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