README: link CHANGELOG.

README.md

@@ -6,10 +6,13 @@ using [CXXRTL], optionally with [Zig] and [zxxrtl].
 See the [template project] for usage, [Sae] for what I'm working on right now,
 and [ili9341spi] for a complete example with Zig.
 
+See the [CHANGELOG] for updates.
+
 [Amaranth]: https://amaranth-lang.org/
 [CXXRTL]: https://yosyshq.readthedocs.io/projects/yosys/en/latest/cmd/write_cxxrtl.html
 [Zig]: https://ziglang.org/
 [zxxrtl]: https://github.com/kivikakk/zxxrtl
 [template project]: https://github.com/kivikakk/niar/tree/main/template
 [Sae]: https://github.com/kivikakk/sae
 [ili9341spi]: https://github.com/kivikakk/ili9341spi
+[CHANGELOG]: CHANGELOG.md