Upgrade gax-nodejs version to 0.11.0 (#259)
Upgrade gax-nodejs version to 0.11.0 (#259)

The new HTTP headers increments the version.
googleapis/googleapis,landrito/googleapis,fuchsia-mirror/third_party-googleapis,googleapis/googleapis,shinfan/googleapis,garrettjonesgoogle/googleapis,ethanbao/googleapis,pongad/googleapis