Sync install script and remove binaries that are no longer in use.

Fix travis Go condition as per https://github.com/travis-ci/docs-trav…

…is-ci-com/pull/2117/files

Update gochecknoglobals

Update to latest gosec.

Fixes #511.

Update install.sh + README.

Ideally we could check in CI that the generated godownloader script
doesn't differ from script/install.sh, but godownloader is currently
broken (goreleaser/godownloader#81).

Fixes #525. Fixes #526.

Fix travis pattern match!

Fixes #523.

Add gochecknoinits and gochecknoglobals to goreleaser config.

Merge pull request #485 from estahn/brew

feat: Add brew instructions to goreleaser

Fix --version and bump to 2.0.5

Agghhhhhhhhh.