* The new resource [Promotional Credits](http://apidocs.chargebee.com/docs/api/promotional_credits) has been added

* The new sub resource [balances](https://apidocs.chargebee.com/docs/api/customers#customer_balances) has been added

* The API end point add_promotional_credits, deduct_promotional_credits and set_promotional_credits has been deprecated in customer resource

** Events added**:
* New Event Type promotional_credits_added and promotional_credits_deducted has been added