Update README.md

Nedyalko Nikolov · Nedyalko Nikolov · commit 86dabc620cf4 · 2015-12-07T11:52:03.000+02:00
Added `gulp` as prerequisite.
diff --git a/README.md b/README.md
@@ -20,7 +20,7 @@ https://docs.nativescript.org/setup/quick-setup
 ## Install dependencies
 
 ```
-$ npm install -g grunt-cli
+$ npm install -g grunt-cli gulp
 ```
 
 Then install the needed NPM packages:
