Update changelog regarding docking feature
- `MenuItem` should be made with `ui.menu_item` and `ui.menu_item_config`.
- `DragDropSource` and `DragDropTarget` should be made with `ui.drag_drop_source_config` and `ui.drag_drop_target`. Both of these methods, and the DragDrop API in general, are likely to change.
+- Added `docking` feature which builds against the upstream docking branch. Only basic API is exposed currently, just enough to enable the docking `imgui_context.io_mut().config_flags |= imgui::ConfigFlags::DOCKING_ENABLE;` - API for programtically docking windows and so on will be added later.
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## [0.8.0] - 2021-09-17
Welcome to the `0.8.0` update. This is one of the largest updates imgui-rs has ever seen; it will generate errors in a `0.7` project, but hopefully it should be both quick to fix, and enjoyable to update. See our [release page](https://github.com/imgui-rs/imgui-rs/releases/tag/v0.8.0) for more information and a list of contributors to this cycle. Thank you to everyone who uses `imgui-rs`, files issues, and spend their time and effort to PR new changes into the codebase. Because of all that effort, this is by far the best `imgui-rs` has looked!
