Version 1.3 release.

Updates CHANGELOG, version, docs.
diff --git a/docs/dyn/compute_v1.targetPools.html b/docs/dyn/compute_v1.targetPools.html
index 0c005f8..8732108 100644
--- a/docs/dyn/compute_v1.targetPools.html
+++ b/docs/dyn/compute_v1.targetPools.html
@@ -450,6 +450,7 @@
         "instance": "A String", # URL of the instance resource.
         "healthState": "A String", # Health state of the instance.
         "ipAddress": "A String", # The IP address represented by this resource.
+        "port": 42, # The port on the instance.
       },
     ],
   }</pre>