Document changes for 2.3.0 release

CHANGES.md

@@ -1,5 +1,29 @@
 # Change Log
 
+## Version 2.3.0 (2017-09-13)
+
+### New features: Orders API
+
+* `CreateOrder` endpoint creates an itemized order which can be referenced in messages to the `Charge` endpoint.
+* `BatchRetrieveOrders` retrieves order objects referenced in one or more transactions based on the provided `order_id`.
+
+**Note:** at this point, `BatchRetrieveOrders only` returns information on paid orders made through Square's eCommerce APIs (Transactions, Checkout).
+
+### Other Changes
+
+* `order` is removed from Transaction
+* `order_id` is added to Transaction
+* `OrderLineItemDiscountType.UNKOWN` renamed to `OrderLineItemDiscountType.UNKOWN_DISCOUNT`
+* `OrderLineItemTaxType.UNKOWN` renamed to `OrderLineItemDiscountType.UNKOWN_TAX`
+* `ChargeRequest.idempotency_key` is restricted to max length 192
+* `ChargeRequest.card_nonce` is restricted to max length 192
+* `ChargeRequest.customer_card_id` is restricted to max length 192
+* `ChargeRequest.reference_id` is restricted to max length 40
+* `ChargeRequest.note` is restricted to max length 60
+* `ChargeRequest.customer_id` is restricted to max length 50
+* `CreateCheckoutRequest.redirect_url` is restricted to max length 800
+* Added `phone_number` and `business_name` to Location
+
 ## Version 2.2.1 (2017-08-11)
 
 * Documentation style and links fixes