Replacing one of the third-party Python bindings. (#2312)

Removing the unmaintained CyImGui (only 7 commits, last one made in 2015) and replacing it with bimpy.

docs/README.md

@@ -126,7 +126,7 @@ Languages: (third-party bindings)
 - Odin: [odin-dear_imgui](https://github.com/ThisDrunkDane/odin-dear_imgui)
 - Pascal: [imgui-pas](https://github.com/dpethes/imgui-pas)
 - PureBasic: [pb-cimgui](https://github.com/hippyau/pb-cimgui)
-- Python: [pyimgui](https://github.com/swistakm/pyimgui) or [CyImGui](https://github.com/chromy/cyimgui) 
+- Python: [pyimgui](https://github.com/swistakm/pyimgui) or [bimpy](https://github.com/podgorskiy/bimpy)
 - Ruby: [ruby-imgui](https://github.com/vaiorabbit/ruby-imgui)
 - Rust: [imgui-rs](https://github.com/Gekkio/imgui-rs) or [imgui-rust](https://github.com/nsf/imgui-rust)
 - Swift [swift-imgui](https://github.com/mnmly/Swift-imgui)