README update re Disqus (jekyll#284)

Need to add full url to config for disqus to work.
bns · Oct 29, 2018 · ffab228 · ffab228
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diff --git a/README.md b/README.md
@@ -162,6 +162,8 @@ Comments are enabled by default and will only appear in production, i.e., `JEKYL
 
 If you don't want to display comments for a particular post you can disable them by adding `comments: false` to that post's YAML Front Matter.
 
+:warning: `url`, e.g. `https://example.com`, must be set in you config file for Disqus to work.
+
 --
 
 ### Social networks