Version 1.3 release.

Updates CHANGELOG, version, docs.
diff --git a/docs/dyn/compute_v1.snapshots.html b/docs/dyn/compute_v1.snapshots.html
index a65110f..285045c 100644
--- a/docs/dyn/compute_v1.snapshots.html
+++ b/docs/dyn/compute_v1.snapshots.html
@@ -159,7 +159,7 @@
       "kind": "compute#snapshot", # Type of the resource.
       "storageBytes": "A String", # A size of the the storage used by the snapshot. As snapshots share storage this number is expected to change with snapshot creation/deletion.
       "description": "A String", # An optional textual description of the resource; provided by the client when the resource is created.
-      "sourceDisk": "A String", # The source disk used to create this snapshot. Once the source disk has been deleted from the system, this field will be cleared, and will not be set even if a disk with the same name has been re-created (output only).
+      "sourceDisk": "A String", # The source disk used to create this snapshot.
       "storageBytesStatus": "A String", # An indicator whether storageBytes is in a stable state, or it is being adjusted as a result of shared storage reallocation.
       "sourceDiskId": "A String", # The 'id' value of the disk used to create this snapshot. This value may be used to determine whether the snapshot was taken from the current or a previous instance of a given disk name.
       "diskSizeGb": "A String", # Size of the persistent disk snapshot, specified in GB (output only).
@@ -194,7 +194,7 @@
           "kind": "compute#snapshot", # Type of the resource.
           "storageBytes": "A String", # A size of the the storage used by the snapshot. As snapshots share storage this number is expected to change with snapshot creation/deletion.
           "description": "A String", # An optional textual description of the resource; provided by the client when the resource is created.
-          "sourceDisk": "A String", # The source disk used to create this snapshot. Once the source disk has been deleted from the system, this field will be cleared, and will not be set even if a disk with the same name has been re-created (output only).
+          "sourceDisk": "A String", # The source disk used to create this snapshot.
           "storageBytesStatus": "A String", # An indicator whether storageBytes is in a stable state, or it is being adjusted as a result of shared storage reallocation.
           "sourceDiskId": "A String", # The 'id' value of the disk used to create this snapshot. This value may be used to determine whether the snapshot was taken from the current or a previous instance of a given disk name.
           "diskSizeGb": "A String", # Size of the persistent disk snapshot, specified in GB (output only).