Golang 1.11.x build executed on Golang 1.7.x

I have a golang 1.11.x build configured for one of my projects. Today this happened:

$ GIMME_OUTPUT="$(gimme 1.11.x | tee -a ${TRAVIS_HOME}/.bashrc)" && eval "$GIMME_OUTPUT"
gimme: given '1.11.x' but no release for '1.11' found
....
$ go version
go version go1.7.4 linux/amd64

Full build log at https://travis-ci.org/firebase/firebase-admin-go/jobs/468142440

Looks like a temporary network failure. https://travis-ci.org/firebase/firebase-admin-go/jobs/468139728

Perhaps gimme can add some retry logic.

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