Docs: "npm run build" was missing from the contributing guides

Close gh-2537

diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 97a7335125c64ff1d6c21f42a2cc5b7e72491deb..3f6547c56822bb3dbc14233bbed5d9ada2e7f44b 100644 (file)
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -95,6 +95,12 @@ Get in the habit of pulling in the "upstream" master to stay up to date as jQuer
 $ git pull upstream master
 ```
 
+Run the build script
+
+```bash
+$ npm run build
+```
+
 Run the Grunt tools:
 
 ```bash