Vendor things

third-party/vendor/downcast-rs/CHANGELOG.md

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+# Changelog
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/)
+and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html).
+
+## 1.2.0 - 2020-06-29
+### Added
+- `no_std` support.
+- CI with GitHub actions.
+
+## 1.1.1 - 2019-10-28
+### Changed
+- Used `dyn Trait` syntax everywhere since it is supported by downcast-rs's
+  min-supported rust version (1.33).
+
+## 1.1.0 - 2019-10-07
+### Added
+- Support for downcasting `Rc<Trait>` and `Arc<Trait>`.
+### Changed
+- Minimum supported Rust version upped to 1.33 to support `Rc` and `Arc` in the
+  receiver position.
+
+## 1.0.4 - 2019-04-08
+### Changed
+- Added `local_inner_macros` to `impl_downcast` to allow invoking via namespace.
+
+## 1.0.3 - 2018-05-21
+### Fixed
+- Use global path for Result, Option, Box in macro expansion to avoid name
+  conflicts with locally-defined symbols.
+
+## 1.0.2 - 2018-05-12
+### Added
+- Support for downcasting `Box<Trait>` to `Box<Concrete>`.
+
+## 1.0.1 - 2018-03-08
+### Fixed
+- Don't use types as traits in macros.
+
+## 1.0.0 - 2017-02-05
+### Changed
+- Cleaned up README and published 1.0.
+
+## 0.1.2 - 2016-11-22
+### Added
+- Support for associated types as well.
+
+## 0.1.1 - 2016-09-04
+### Added
+- Downcast functionality to downcast borrowed mutable and immutable trait
+  objects to concrete types. Supports concrete type parameters and type
+  variables with optional constraints.
+