Update docs regarding script include

Author: felixmosh

README.md

@@ -41,20 +41,7 @@ See [the demo file](demo/usage.html) for a quick usage example.
 
 - First, you need to get a valid recaptcha key for your domain. Go to http://www.google.com/recaptcha.
 
-- Include the reCaptcha [API](https://developers.google.com/recaptcha/docs/display#AJAX) using this script in your HTML:
-
-```html
-<script
-  src="https://www.google.com/recaptcha/api.js?onload=vcRecaptchaApiLoaded&render=explicit"
-  async defer
-></script>
-```
-
-As you can see, we are specifying a `onload` callback, which will notify the angular service once the api is ready for usage.
-
-The `onload` callback name defaults to `vcRecaptchaApiLoaded`, but can be overridden by the service provider via `vcRecaptchaServiceProvider.setOnLoadFunctionName('myOtherFunctionName');`.
-
-- Also include the vc-recaptcha script and make your angular app depend on the `vcRecaptcha` module.
+- Include the vc-recaptcha script and make your angular app depend on the `vcRecaptcha` module.
 
 ```html
 <script type="text/javascript" src="angular-recaptcha.js"></script>