Fix README.md

Author: LubomirGeorgiev

README.md

@@ -143,14 +143,14 @@ You can change the duration of your animations, add a delay or change the number
 *Note: be sure to replace "vendor" in the CSS with the applicable vendor prefixes (webkit, moz, etc)*
 
 ## Custom Builds
-Animate.css is powered by [Grunt](http://gruntjs.com), and you can create custom builds pretty easily. First of all, you’ll need Grunt and all other dependencies:
+Animate.css is powered by [gulp.js](http://gulpjs.com/), and you can create custom builds pretty easily. First of all, you’ll need Gulp and all other dependencies:
 
 ```sh
 $ cd path/to/animate.css/
 $ sudo npm install
 ```
 
-Next, run `grunt watch` to watch for changes and compile your custom builds. For example, if you want only some of the the “attention seekers”, simply edit the `animate-config.json` file to select only the animations you want to use.
+Next, run `gulp` to compile your custom builds. For example, if you want only some of the the “attention seekers”, simply edit the `animate-config.json` file to select only the animations you want to use.
 
 ```javascript
 "attention_seekers": {