Update README.md

Claptar · Copilot · web-flow · commit 491752192389 · 2026-01-15T16:51:53.000Z
Co-authored-by: Copilot &lt;175728472+Copilot@users.noreply.github.com&gt;
diff --git a/README.md b/README.md
@@ -21,7 +21,7 @@ For development and testing:
 uv sync --extra dev
 ```
 
-See [docs/TESTS.md](docs/TESTS.md) for testing documentation.
+See [docs/TESTING.md](docs/TESTING.md) for testing documentation.
 
 ## Usage
 Invoke any subcommand via `uv run h5ad ...`:
