Update README to reflect reduced unsafe usage
@@ -88,8 +88,7 @@ This reimplementation tries to avoid uses of `unsafe` and thus should enjoy
Rust's usual safety guarantees. After all, the best way to trust the unsafe code
coming out of your code generator is if your code generator does not generate
any unsafe code. Unsafe code is currently necessary for FFI binding to a handful
-of functions from libxcb (see `src/xcb_ffi.rs`) and a special append-only
-data-structure (see `ExtensionInformation` in `src/connection.rs`).
+of functions from libxcb (see `src/xcb_ffi.rs`).
This means that this project is even safer than libxcb, because libxcb forces
its users to blindly trust length fields that come from the X11 server.
