setup-sdl: README.md: fix action.yml link

From 2343b6c61d6def3048fbd8e8f2e2363f609464c3 Mon Sep 17 00:00:00 2001
From: Anonymous Maarten <[EMAIL REDACTED]>
Date: Tue, 25 Jul 2023 21:09:33 +0200
Subject: [PATCH] README.md: fix action.yml link

---
 README.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/README.md b/README.md
index b7ad6df..f42e67c 100644
--- a/README.md
+++ b/README.md
@@ -44,4 +44,4 @@ Using the `version` option, a SDL release can be used or the latest git tag:
 
 ## Options
 
-See [actions.yml] for an overview of all options, and its defaults.
+See [action.yml](action.yml) for an overview of all options, and its defaults.