Upgraded from go 1.4 to go 1.5 due to e.g. https://pastebin.mozilla.org/8863624
Upgraded from go 1.4 to go 1.5 due to e.g. https://pastebin.mozilla.org/8863624

taskcluster/taskcluster-client-java,taskcluster/taskcluster-client-java,taskcluster/taskcluster-client-java