merge v2.7.0 change log from github back to bitbucket

Squashed commit of the following:

commit ecc71c6e71d95f6a8ec1b437e85f611a2bfa07c5
Author: Jason Yin <[email protected]>
Date:   Mon Oct 29 13:48:07 2018 -0700

    add before

commit 1484c2d3e870cc4bda46713c97411ddd1e87bd27
Author: Jason Yin <[email protected]>
Date:   Mon Oct 29 13:46:00 2018 -0700

    remove extra space

commit cf114851972a3809cb9560aac04dd2cf9684f9b0
Author: Jason Yin <[email protected]>
Date:   Mon Oct 29 13:45:06 2018 -0700

    fix change log error

commit d2a3766
Author: Esteban Ginez <[email protected]>
Date:   Fri Oct 19 17:24:02 2018 -0700

    Update CHANGELOG.md

commit 8331745
Author: Esteban G <[email protected]>
Date:   Thu Oct 18 15:49:39 2018 -0700

    Removing unncessary text from changelog

commit 24f3c66
Author: Esteban G <[email protected]>
Date:   Thu Oct 18 15:33:53 2018 -0700

    Moving changelog changes to right release

commit 8276c3d
Author: Esteban Ginez <[email protected]>
Date:   Thu Oct 18 14:36:27 2018 -0700

    Changes to changelog to reflect api modifications (#136)

Author: jasonyin

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
@@ -19,6 +19,38 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/)
 - The signing algorithm does not lower case the header fields [Github issue 132](https://github.com/oracle/oci-go-sdk/issues/132)
 - Raw configuration provider does not check for empty strings [Github issue 134](https://github.com/oracle/oci-go-sdk/issues/134)
 
+### Known issue
+-  Block Storage service for copying volume backups across regions is not enabled
+
+### Breaking change
+- DbDataSizeInMBs field in Backup and BackupSummary struct was renamed to DatabaseSizeInGBs and type changed from *int to *float64 
+    - 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 and BackupSummary struct was 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"`
+    ```
+
 ## 2.6.0 - 2018-10-04
 ### Added
 - Support for trusted partner images through application listings and subscriptions in the Compute service