don't go get -u for golangci-lint
don't go get -u for golangci-lint

golangci-lint is actually dependent on a specific not-quite
most recent version of golang.org/x/tools, fixing the dependency
is hard and requires changing one of the upstream packages,
just omitting the `-u` lets golangci-lint grab the version it
wants and use that.

travisturner/pilosa