Changes to changelog to reflect api modifications (#136)

Author: eginez

CHANGELOG.md

@@ -10,7 +10,7 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/)
 - Support for generating and downloading wallets in the Database service
 - Support for creating a standalone backup from an on-premises database in the Database service
 - Support for db version and additional connection strings in the Autonomous Transaction Processing and Autonomous Data Warehouse resources of the Database service
-- Support for copying volume backups across regions in the Block Storage service
+- Support for copying volume backups across regions in the Block Storage service (please see Known issue)
 - Support for deleting compartments in the Identity service
 - Support for reboot migration for virtual machines in the Compute service
 - Support for Instance Pools and Instance Configurations in the Compute service
@@ -26,6 +26,39 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/)
 - Support for copying objects across regions in the Object Storage service
 - Support for network address translation (NAT) gateways in the Networking service
 
+### Known issue
+-  Block Storage service for copying volume backups across regions is not enabled
+
+### Breaking change
+- DbDataSizeInMBs field in Backup struct is renamed to DatabaseSizeInGBs and type changed from *int to *float64 (SDK owners pls update this based on the language)
+    - Before
+
+    ```golang
+    // Size of the database in megabytes (MB) at the time the backup was taken.
+    DbDataSizeInMBs *int `mandatory:"false" json:"dbDataSizeInMBs"`
+    ```
+
+    - After
+
+    ```golang
+    // The size of the database in gigabytes at the time the backup was taken.
+    DatabaseSizeInGBs *float64 `mandatory:"false" json:"databaseSizeInGBs"`
+    ```
+- Data type for DatabaseEdition in Backup struct is changed from *string to BackupDatabaseEditionEnum
+    - Before
+
+    ```golang
+    // The Oracle Database edition of the DB system from which the database backup was taken.
+    DatabaseEdition *string `mandatory:"false" json:"databaseEdition"`
+    ```
+
+    - After
+
+    ```golang
+     // The Oracle Database edition of the DB system from which the database backup was taken.
+     DatabaseEdition BackupDatabaseEditionEnum `mandatory:"false" json:"databaseEdition,omitempty"`
+    ```
+
 ## 2.5.0 - 2018-09-27
 ### Added
 - Support for paravirtualized launch mode when importing images in the Compute service