Update README.md (#3822)

add module.exports to How to use
gatsbyjs · Feb 6, 2018 · f9a3ccd · f9a3ccd
1 parent 014bda5
commit f9a3ccd
Showing 1 changed file with 3 additions and 1 deletion.
diff --git a/packages/gatsby-transformer-sharp/README.md b/packages/gatsby-transformer-sharp/README.md
@@ -16,7 +16,9 @@ including resizing, cropping, and creating responsive images.
 
 ```javascript
 // In your gatsby-config.js
-plugins: [`gatsby-transformer-sharp`];
+module.exports = {
+  plugins: [`gatsby-transformer-sharp`]
+}
 ```
 
 ## Parsing algorithm