Fix toml file even more

Author: annegentle

netlify.toml

@@ -29,7 +29,7 @@ package = "netlify-plugin-checklinks"
   # You can mark some check as skipped, which will block checklinks
   # from ever attempting to execute them.
   # skipPatterns is an array of strings you can match against failing reports
-  skipPatterns = [at: _site/feed.xml]
+  skipPatterns = ["at: _site/feed.xml"]
 
   # You can mark some check as todo, which will execute the check, but allow failures.
   # todoPatterns is an array of strings you can match against failing reports