Add information about custom presets/plugins to readme

README.md

@@ -18,7 +18,7 @@ Installation
 
 There are several ways to get a copy of babel-standalone. Pick whichever one you like:
 
-- Use it via CDNJS: https://cdnjs.cloudflare.com/ajax/libs/babel-standalone/6.14.0/babel.min.js. This is a simple way to embed it on a webpage without having to do any other setup.
+- Use it via CDNJS: https://cdnjs.cloudflare.com/ajax/libs/babel-standalone/6.18.1/babel.min.js. This is a simple way to embed it on a webpage without having to do any other setup.
 - Install via Bower: `bower install babel-standalone`
 - Install via NPM: `npm install --save babel-standalone`
 - Manually grab `babel.js` and/or `babel.min.js` from the [GitHub releases page](https://github.com/Daniel15/babel-standalone/releases). Every release includes these files.
@@ -38,7 +38,7 @@ When loaded in a browser, babel-standalone will automatically compile and execut
 ```html
 <div id="output"></div>
 <!-- Load Babel -->
-<script src="https://cdnjs.cloudflare.com/ajax/libs/babel-standalone/6.14.0/babel.min.js"></script>
+<script src="https://cdnjs.cloudflare.com/ajax/libs/babel-standalone/6.18.1/babel.min.js"></script>
 <!-- Your custom script here -->
 <script type="text/babel">
 const getMessage = () => "Hello World";
@@ -57,3 +57,37 @@ Loading external scripts via `src` attribute is supported too:
 ```
 
 Note that `.babelrc` doesn't work in babel-standalone, as no file system access is available. The presets and/or plugins to use **must** be specified in the options passed to `Babel.transform`.
+
+Customisation
+=============
+Custom plugins and presets can be added using the `registerPlugin` and `registerPreset` methods respectively:
+
+```js
+// Simple plugin that converts every identifier to "LOL"
+function lolizer() {
+  return {
+    visitor: {
+      Identifier(path) {
+        path.node.name = 'LOL';
+      }
+    }
+  }
+}
+Babel.registerPlugin('lolizer', lolizer);
+```
+
+Once registered, just use the name of the plugin:
+
+```js
+var output = Babel.transform(
+  'function helloWorld() { alert(hello); }',
+  {plugins: ['lolizer']}
+);
+// Returns "function LOL() { LOL(LOL); }"
+```
+
+Custom plugins also work for inline `<script>`s:
+
+```html
+<script type="text/babel" data-plugins="lolizer">
+```