Politeia cannot be built in Go 1.13

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Dependency resolution fails.

$ cd politeiavoter/                                                                                                                                                                           
$ go install
go: github.com/marcopeereboom/sbox@v0.0.0-20190125180204-32a7c85e429a requires
        github.com/golangci/golangci-lint@v1.13.1 requires
        github.com/go-critic/go-critic@v0.0.0-20181204210945-0af0999fabfb: invalid pseudo-version: does not match version-control timestamp (2019-01-08T19:27:14Z)

More details:

• fix invalid dependencies golangci/golangci-lint#605
• golangci-lint won't compile with Go modules on go 1.13 golangci/golangci-lint#652
• Build errors using Go 1.13 golangci/golangci-lint#659

golangci-lint's maintainer has been MIA for 6 weeks.

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See also marcopeereboom/sbox#1 and marcopeereboom/sbox#2 for a second, separate build error.