Commits on Feb 4, 2020

1. subscriber: prepare to release 0.2.0 stable …

   0.2.0 (February 4, 2020)
   
   Breaking Changes:
   
   - **fmt**: Renamed `Context` to `FmtContext` (#420, #425)
   - **fmt**: Renamed `Builder` to `SubscriberBuilder` (#420)
   - **filter**: Removed `Filter`. Use `EnvFilter` instead (#434)
   
   Added:
   
   - **registry**: `Registry`, a reusable span store that `Layer`s can use
     a high-performance, in-memory store. (#420, #425, #432, #433, #435)
   - **registry**: Added `LookupSpan` trait, implemented by `Subscriber`s
     to expose stored span data to `Layer`s (#420)
   - **fmt**: Added `fmt::Layer`, to allow composing log formatting with
     other `Layer`s (#420)
   - **fmt**: Added support for JSON field and event formatting (#377,
     #415)
   - **filter**: Documentation for filtering directives (#554)
   
   Changed:
   
   - **fmt**: Renamed `Context` to `FmtContext` (#420, #425) (BREAKING)
   - **fmt**: Renamed `Builder` to `SubscriberBuilder` (#420) (BREAKING)
   - **fmt**: Reimplemented `fmt::Subscriber` in terms of the `Registry`
     and `Layer`s (#420)
   
   Removed:
   
   - **filter**: Removed `Filter`. Use `EnvFilter` instead (#434) (BREAKING)
   
   Fixed:
   
   - **fmt**: Fixed memory leaks in the slab used to store per-span data
     (3c35048)
   - **fmt**: `fmt::SubscriberBuilder::init` not setting up `log`
     compatibility (#489)
   - **fmt**: Spans closed by a child span closing not also closing _their_
     parents (#514)
   - **Layer**: Fixed `Layered` subscribers failing to downcast to their
     own type (#549)
   - **Layer**: Fixed `Layer::downcast_ref` returning invalid references
     (#454)
   
   Signed-off-by: Eliza Weisman <[email protected]>

   

   hawkw committed Feb 4, 2020
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