ci: switch Go version to latest release; lint #53
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Previously, we used "master" version of Go on Travis CI.
Apparently, this uses a tip version and not the latest release.
So, use a fixed version.
The downside is we'll need to update it with each new Go release,
but it's still better than building release binaries using
a tip version.
Once submitted, #33 (comment) can be rebased to make that PR green.
R: @didrocks @samtstern