Branch names conflict with go modules

[mycroftcanner]

googleapis/google-api-go-client#381

If no specific version is requested, that is there's no @master or @some-other-tag in the argument, the Go command will ask for a list of available versions for this module. It will only consider tags, not branches, unless a branch is specifically requested by name. But if the branch is named v2 or latest or something else that has a specific meaning as a query, that specific meaning wins.

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