Update README.md (#52)

Update build instructions, as the build was failing without running `npm run build` first
ghostery · Nov 17, 2018 · ea8b636 · ea8b636
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commit ea8b636
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diff --git a/README.md b/README.md
@@ -22,6 +22,7 @@ $ npm install
 
 Build:
 ```sh
+$ npm run build
 $ npm run bundle
 ```