update bindgen url for sokol-d

bindgen/README.md

@@ -24,7 +24,7 @@ To update the Zig bindings:
 > git clone https://github.com/floooh/sokol-nim
 > git clone https://github.com/floooh/sokol-odin
 > git clone https://github.com/floooh/sokol-rust
-> git clone https://github.com/floooh/sokol-d
+> git clone https://github.com/kassane/sokol-d
 > git clone https://github.com/colinbellino/sokol-jai
 > git clone https://github.com/floooh/sokol-c3
 > python3 gen_all.py