Update CDN versions to 2+ and 0.4

Author: m-hulbert

README.md

@@ -88,8 +88,8 @@ To use Spaces you must also set a [`clientId`](https://ably.com/docs/auth/identi
 You can also use Spaces with a CDN, such as [unpkg](https://www.unpkg.com/):
 
 ```html
-<script src="https://cdn.ably.com/lib/ably.min-1.js"></script>
-<script src="https://cdn.ably.com/spaces/0.1.2/iife/index.bundle.js"></script>
+<script src="https://cdn.ably.com/lib/ably.min-2.js"></script>
+<script src="https://cdn.ably.com/spaces/0.4/iife/index.bundle.js"></script>
 ```
 
 After this, instantiate the SDK in the same way as in the NPM option above: