plugin-feed: Note feed xml file is production only (#5305)

Add note that the rss.xml feed is only generated in production.
gatsbyjs · May 8, 2018 · a9110d9 · a9110d9
1 parent b6699fc
commit a9110d9
Showing 1 changed file with 2 additions and 0 deletions.
diff --git a/packages/gatsby-plugin-feed/README.md b/packages/gatsby-plugin-feed/README.md
@@ -83,3 +83,5 @@ plugins: [
   },
 ];
 ```
+
+NOTE: This plugin only generates the `/rss.xml` file when run in `production` mode! To test your feed, run: `gatsby build && gatsby serve`.