Commits on Oct 6, 2022

1. core: prepare to release v0.1.30 …

   # 0.1.30 (October 6, 2022)
   
   This release of `tracing-core` adds a new `on_register_dispatch` method
   to the `Subscriber` trait to allow the `Subscriber` to perform
   initialization after being registered as a `Dispatch`, and a
   `WeakDispatch` type to allow a `Subscriber` to store its own `Dispatch`
   without creating reference count cycles.
   
   ### Added
   
   - `Subscriber::on_register_dispatch` method ([#2269])
   - `WeakDispatch` type and `Dispatch::downgrade()` function ([#2293])
   
   Thanks to @jswrenn for contributing to this release!
   
   [#2269]: #2269
   [#2293]: #2293

   

   hawkw committed Oct 6, 2022
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