ci: update release process

[mavogel]

Proposal

for new release process of the artifacts and homebrew taps at https://github.com/git-chglog/homebrew-git-chglog

Goreleaser

Currently, a combination of gox and ghr is used for the release process.

I'd propose using https://github.com/goreleaser/goreleaser which not only combines both steps but also offers more options to use the released artifacts (docker, brew, snap to name a few). Furthermore, it would be possible to seamlessly integrate with goreleasers' inverse https://github.com/goreleaser/godownloader. Which automatically generates download bash scripts for a released artifact version based on the .goreleaser.yml.

This would make it easier to use the git-chglog tool for artifacts and in pipelines.

gh-actions

Furthermore, use github actions for ci as travis does not respond back to the PRs. See comment