fix(third_party/github.com/coreos/go-semver): the copy of go-semver included in Fleet has an incorrect import path. "third_party" is missing from the import path. This causes the "go get" command to fail.
Merge pull request #518 from Shopify/go-semver_example.go_fix

fix(third_party/github.com/coreos/go-semver): fix incorrect import path