README.md in ably-rest-0.8.5 vs README.md in ably-rest-0.8.6

@@ -27,10 +27,10 @@
 ## Using the REST API
 
 All examples assume a client and/or channel has been created as follows:
 
 ```ruby
-client = Ably::Rest.new(api_key: 'xxxxx')
+client = Ably::Rest.new(key: 'xxxxx')
 channel = client.channel('test')
 ```
 
 ### Publishing a message to a channel