readme: update with 3.9.1 info

readme.md

@@ -19,7 +19,7 @@ First, update your `build.zig.zon`:
 ```sh
 # Initialize a `zig build` project if you haven't already
 zig init
-# replace <refname> with the version you want to use, e.g. 3.8.2+1
+# replace <refname> with the version you want to use, e.g. 3.9.1
 zig fetch --save git+https://github.com/allyourcodebase/nats.c.git#<refname>
 ```
 
@@ -47,11 +47,12 @@ The NATS.c library has optional dependencies:
 
 These dependencies are currently automatically retrieved and compiled as static libraries by the Zig build system.
 
-## Version Support Matrix
+## Zig Version Support Matrix
 
 |  Refname  | NATS.c Version | Zig `0.12.x` | Zig `0.13.x` | Zig `0.14.0-dev` |
 |-----------|----------------|--------------|--------------|------------------|
-| `3.8.2+1` | `3.8.2+1`     | ✅           | ✅          | ✅               |
+| `3.9.1`   | `3.9.1`        | ✅           | ✅          | ✅               |
+| `3.8.2+1` | `3.8.2`        | ✅           | ✅          | ✅               |
 
 [nats.c]: https://github.com/nats-io/nats.c
 [libressl]: https://github.com/allyourcodebase/libressl