Release v1.6.0 (#324)

* Update version and changelog for v1.6.0
* Update docs
diff --git a/docs/dyn/deploymentmanager_v2.operations.html b/docs/dyn/deploymentmanager_v2.operations.html
index 06bf839..45db8e0 100644
--- a/docs/dyn/deploymentmanager_v2.operations.html
+++ b/docs/dyn/deploymentmanager_v2.operations.html
@@ -78,7 +78,7 @@
   <code><a href="#get">get(project, operation)</a></code></p>
 <p class="firstline">Gets information about a specific operation.</p>
 <p class="toc_element">
-  <code><a href="#list">list(project, maxResults=None, pageToken=None, filter=None)</a></code></p>
+  <code><a href="#list">list(project, orderBy=None, maxResults=None, pageToken=None, filter=None)</a></code></p>
 <p class="firstline">Lists all operations for a project.</p>
 <p class="toc_element">
   <code><a href="#list_next">list_next(previous_request, previous_response)</a></code></p>
@@ -138,16 +138,21 @@
     },
     "endTime": "A String", # [Output Only] The time that this operation was completed. This value is in RFC3339 text format.
     "selfLink": "A String", # [Output Only] Server-defined URL for the resource.
-    "targetLink": "A String", # [Output Only] The URL of the resource that the operation modifies. If creating a persistent disk snapshot, this points to the persistent disk that the snapshot was created from.
+    "targetLink": "A String", # [Output Only] The URL of the resource that the operation modifies. For operations related to creating a snapshot, this points to the persistent disk that the snapshot was created from.
   }</pre>
 </div>
 
 <div class="method">
-    <code class="details" id="list">list(project, maxResults=None, pageToken=None, filter=None)</code>
+    <code class="details" id="list">list(project, orderBy=None, maxResults=None, pageToken=None, filter=None)</code>
   <pre>Lists all operations for a project.
 
 Args:
   project: string, The project ID for this request. (required)
+  orderBy: string, Sorts list results by a certain order. By default, results are returned in alphanumerical order based on the resource name.
+
+You can also sort results in descending order based on the creation timestamp using orderBy="creationTimestamp desc". This sorts results based on the creationTimestamp field in reverse chronological order (newest result first). Use this to sort resources like operations so that the newest operation is returned first.
+
+Currently, only sorting by name or creationTimestamp desc is supported.
   maxResults: integer, The maximum number of results per page that should be returned. If the number of available results is larger than maxResults, Compute Engine returns a nextPageToken that can be used to get the next page of results in subsequent list requests.
   pageToken: string, Specifies a page token to use. Set pageToken to the nextPageToken returned by a previous list request to get the next page of results.
   filter: string, Sets a filter expression for filtering listed resources, in the form filter={expression}. Your {expression} must be in the format: field_name comparison_string literal_string.
@@ -209,7 +214,7 @@
         },
         "endTime": "A String", # [Output Only] The time that this operation was completed. This value is in RFC3339 text format.
         "selfLink": "A String", # [Output Only] Server-defined URL for the resource.
-        "targetLink": "A String", # [Output Only] The URL of the resource that the operation modifies. If creating a persistent disk snapshot, this points to the persistent disk that the snapshot was created from.
+        "targetLink": "A String", # [Output Only] The URL of the resource that the operation modifies. For operations related to creating a snapshot, this points to the persistent disk that the snapshot was created from.
       },
     ],
   }</pre>