esm readme tweak

README.md

@@ -189,10 +189,9 @@ Here's how to import and initialize the ES module version of reveal.js, includin
 ```html
 <script type="module">
   import Reveal from '/dist/reveal.js';
-  import markdown from '/plugin/markdown/markdown.js';
+  import Markdown from '/plugin/markdown/markdown.js';
   Reveal.initialize({
-    keyboard: true,
-    plugins: [ markdown() ]
+    plugins: [ Markdown ]
   });
 </script>
 ```
@@ -625,6 +624,8 @@ loaded when they become visible.
 
 ### Plugins
 
+**Outdated, this will be rewritten to match the 4.0 plugin API**
+
 Plugins should register themselves with reveal.js by calling `Reveal.registerPlugin( MyPlugin )`. Registered plugins _must_ expose a unique `id` property and can optionally expose an `init` function that reveal.js will call to initialize them.
 
 When reveal.js is booted up via `initialize()`, it will go through all registered plugins and invoke their `init` methods. If the `init` method returns a Promise, reveal.js will wait for that promise to be fulfilled before finishing the startup sequence and firing the [ready](#ready-event) event. Here’s an example of a plugin that does some asynchronous work before reveal.js can proceed:
@@ -643,11 +644,15 @@ Reveal.initialize({
 } );
 ```
 
-Note that reveal.js will *not* wait for init Promise fulfillment if the plugin is loaded as an [async dependency](#dependencies). If the plugin’s init method does _not_ return a Promise, the plugin is considered ready right away and will not hold up the reveal.js startup sequence.
+If the plugin’s init method does _not_ return a Promise, the plugin is considered ready right away and will not hold up the reveal.js startup sequence.
+
+### Manually Registering Plugins
+
+TBD. Describe how plugins can be registered after reveal.js is already initialized.
 
 ### Retrieving Plugins
 
-If you want to check if a specific plugin is registered you can use the `Reveal.hasPlugin` method and pass in a plugin ID, for example: `Reveal.hasPlugin( ’myPlugin’ )`. If you want to retrieve a plugin instance you can use `Reveal.getPlugin( ’myPlugin’ )`.
+If you want to check if a specific plugin is registered you can use the `Reveal.hasPlugin` method and pass in a plugin ID, for example: `Reveal.hasPlugin( ’my-plugin’ )`. If you want to retrieve a plugin instance you can use `Reveal.getPlugin( ’my-plugin’ )`.
 
 ### Dependencies