v0.8.1

Merry Christmas Eve, here's an imgui-rs patch.

• FIXES: various memory safety issues around input_text and input_text_multiline. We are primarily releasing this patch to fix this issue.
• FIXES: docs are now generated for our feature branches on crates.io. Thanks @Jasper-Bekkers
• ADD: adds winit-0.26 support. thanks @cwfitzgerald

We'll see you all soon for v0.9.0, which will include a reworked main API (no more imgui::Window::new) and the docking branch.