Change example for connecting to an account

The old example only worked for the open source sync engine API case. In this case, email address and provider are not available on this object. We should change this but in the meantime, we'll give an example that works.

Author: brettgerry

README.md

@@ -75,9 +75,10 @@ implementing the auth flow.
 ```python
 client = APIClient(APP_ID, APP_SECRET, token)
 
-# Print out the email address and provider (Gmail, Exchange)
-print client.account.email_address
-print client.account.provider
+# Print out the account_id
+account = client.accounts.first()
+print account.as_json()
+print account.as_json()['account_id']
 ```