Releasing version V1.6.0

Squashed commit of the following:

commit df39d2d8d6b59705a26aa068bf985449893e9f9f
Author: Jason Yin <[email protected]>
Date:   Thu May 31 17:08:31 2018 +0000

    Releasing version 1 6 0

Author: jasonyin

CHANGELOG.md

@@ -4,9 +4,55 @@ All notable changes to this project will be documented in this file.
 
 The format is based on [Keep a Changelog](http://keepachangelog.com/)
 
-## 1.5.0 - 2018-05-17
+## 1.6.0 - 2018-05-31
 ### Added
+- Support for the "soft shutdown" instance action in the Compute service
+- Support for Auth Token management in the Identity service
 - Support for backup or clone of multiple volumes at once using volume groups in the Block Storage service
+- Support for launching a database system from a backup in the Database service
+
+### Breaking changes
+- ``LaunchDbSystemDetails`` is renamed to ``LaunchDbSystemBase`` and the type changed from struct to interface in ``LaunchDbSystemRequest``. Here is sample code that shows how to update your code to incorporate this change. 
+
+    - Before
+
+    ```golang
+    // create a LaunchDbSystemRequest
+    // There were two ways to initialize the LaunchDbSystemRequest struct.
+    // This breaking change only impact option #2
+    request := database.LaunchDbSystemRequest{}
+
+    // #1. explicity create LaunchDbSystemDetails struct (No impact)
+    details := database.LaunchDbSystemDetails{}
+    details.AvailabilityDomain = common.String(validAD())
+    details.CompartmentId = common.String(getCompartmentID())
+    // ... other properties
+    request.LaunchDbSystemDetails = details
+
+    // #2. use anonymous fields (Will break)
+    request.AvailabilityDomain = common.String(validAD())
+    request.CompartmentId = common.String(getCompartmentID())
+    // ...
+    ```
+
+    - After
+
+    ```golang
+    // create a LaunchDbSystemRequest
+    request := database.LaunchDbSystemRequest{}
+    details := database.LaunchDbSystemDetails{}
+    details.AvailabilityDomain = common.String(validAD())
+    details.CompartmentId = common.String(getCompartmentID())
+    // ... other properties
+
+    // set the details to LaunchDbSystemBase
+    request.LaunchDbSystemBase = details
+    // ...
+    ```
+
+## 1.5.0 - 2018-05-17
+### Added
+- ~~Support for backup or clone of multiple volumes at once using volume groups in the Block Storage service~~
 - Support for the ability to optionally specify a compartment filter when listing exports in the File Storage service
 - Support for tagging virtual cloud network resources in the Networking service
 - Support for specifying the PARAVIRTUALIZED remote volume type when creating a virtual image or launching a new instance in the Compute service

common/version.go

@@ -48,6 +48,9 @@ type BootVolume struct {
 
 	// The size of the boot volume in GBs.
 	SizeInGBs *int `mandatory:"false" json:"sizeInGBs"`
+
+	// The OCID of the source volume group.
+	VolumeGroupId *string `mandatory:"false" json:"volumeGroupId"`
 }
 
 func (m BootVolume) String() string {