Removed reference to API v1

Author: aaguiarz

README.md

@@ -35,21 +35,6 @@ auth0 = Auth0Client.new(
 puts auth0.get_users
 ```
 
-Using [APIv1](https://auth0.com/docs/api/v1)
-
-```ruby
-require "auth0"
-
-auth0 = Auth0Client.new(
-  :client_id => "YOUR CLIENT ID",
-  :client_secret => "YOUR CLIENT SECRET",
-  :domain => "<YOUR ACCOUNT>.auth0.com",
-  :api_version => 1
-)
-
-puts auth0.get_users
-```
-
 ### Timeout
 You can setup a custom timeout in the Auth0Client. By default it is set to 10 minutes.