Add a link in the guide.

Author: nedtwigg

selfie.dev/src/pages/py/get-started.mdx

@@ -18,7 +18,7 @@ To start snapshot testing in Python, all you need is to add a [single dependency
 Selfie snapshot testing works with the following Python test runners:
 
 - Pytest
-- PRs welcome for other test runners
+- PRs welcome for other test runners (see [here](https://github.com/diffplug/selfie/issues/350) for a guide)
 
 Both disk and inline snapshots can be used with Python test code.