docs: fix import in README (#140)

KnorpelSenf · web-flow · commit 8bdc049b1b02 · 2025-05-16T00:04:08.000+02:00
diff --git a/README.md b/README.md
@@ -8,7 +8,7 @@ CSS, syntax highlighting, and HTML sanitization.
 First install the package with the command:
 
 ```sh
-deno add @deno/gfm
+deno add jsr:@deno/gfm
 ```
 
 ```js
