Merge pull request #41 from ably/fix/readme-laravel-echo

Fix readme laravel echo

README.md

@@ -67,7 +67,7 @@ Finally, you are ready to install and configure [Ably Laravel Echo](https://gith
 
 [Ably Laravel Echo](https://github.com/ably-forks/echo/) is a JavaScript library that makes it painless to subscribe to channels and listen for events broadcast by your server-side broadcasting driver. Ably is maintaining a fork of the official laravel-echo module which allows you to use the official [ably-js SDK](https://github.com/ably/ably-js). In this example, we will also install the official ably package:
 ```
-npm install @ably/laravel-echo ably
+npm install @ably/laravel-echo ably@1.x
 ```
 
 Once Echo is installed, you are ready to create a fresh Echo instance in your applications JavaScript. A great place to do this is at the bottom of the `resources/js/bootstrap.js` file that is included with the Laravel framework. By default, an example Echo configuration is already included in this file; however, the default configuration in the `bootstrap.js` file is intended for Pusher. You may copy the configuration below to transition your configuration to Ably.