Release v1.6.0 (#324)

* Update version and changelog for v1.6.0
* Update docs
diff --git a/docs/dyn/compute_alpha.routes.html b/docs/dyn/compute_alpha.routes.html
index 1101173..7220a8e 100644
--- a/docs/dyn/compute_alpha.routes.html
+++ b/docs/dyn/compute_alpha.routes.html
@@ -147,7 +147,7 @@
     },
     "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>
 </div>
 
@@ -177,6 +177,7 @@
     "nextHopInstance": "A String", # The URL to an instance that should handle matching packets. You can specify this as a full or partial URL. For example:
         # https://www.googleapis.com/compute/v1/projects/project/zones/zone/instances/
     "priority": 42, # The priority of this route. Priority is used to break ties in cases where there is more than one matching route of equal prefix length. In the case of two routes with equal prefix length, the one with the lowest-numbered priority value wins. Default value is 1000. Valid range is 0 through 65535.
+    "nextHopPeering": "A String", # [Output Only] The network peering name that should handle matching packets, which should conform to RFC1035.
     "nextHopNetwork": "A String", # The URL of the local network if it should handle matching packets.
     "network": "A String", # Fully-qualified URL of the network that this route applies to.
     "selfLink": "A String", # [Output Only] Server-defined fully-qualified URL for this resource.
@@ -225,6 +226,7 @@
   "nextHopInstance": "A String", # The URL to an instance that should handle matching packets. You can specify this as a full or partial URL. For example:
       # https://www.googleapis.com/compute/v1/projects/project/zones/zone/instances/
   "priority": 42, # The priority of this route. Priority is used to break ties in cases where there is more than one matching route of equal prefix length. In the case of two routes with equal prefix length, the one with the lowest-numbered priority value wins. Default value is 1000. Valid range is 0 through 65535.
+  "nextHopPeering": "A String", # [Output Only] The network peering name that should handle matching packets, which should conform to RFC1035.
   "nextHopNetwork": "A String", # The URL of the local network if it should handle matching packets.
   "network": "A String", # Fully-qualified URL of the network that this route applies to.
   "selfLink": "A String", # [Output Only] Server-defined fully-qualified URL for this resource.
@@ -295,7 +297,7 @@
     },
     "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>
 </div>
 
@@ -343,6 +345,7 @@
         "nextHopInstance": "A String", # The URL to an instance that should handle matching packets. You can specify this as a full or partial URL. For example:
             # https://www.googleapis.com/compute/v1/projects/project/zones/zone/instances/
         "priority": 42, # The priority of this route. Priority is used to break ties in cases where there is more than one matching route of equal prefix length. In the case of two routes with equal prefix length, the one with the lowest-numbered priority value wins. Default value is 1000. Valid range is 0 through 65535.
+        "nextHopPeering": "A String", # [Output Only] The network peering name that should handle matching packets, which should conform to RFC1035.
         "nextHopNetwork": "A String", # The URL of the local network if it should handle matching packets.
         "network": "A String", # Fully-qualified URL of the network that this route applies to.
         "selfLink": "A String", # [Output Only] Server-defined fully-qualified URL for this resource.