ci :updates release process

[mavogel]

What does this do / why do we need it?

• the release process with gox and manual homebrew formula can be accomplished by fully automated with goreleaser
• ci with travis is broken and PRs are red and cannot be merged. Only by project administrators
• Github Actions are more flexible and there is also an action for goreleaser

How this PR fixes the problem?

• Updates to goreleaser and gh-actions
• Releases automatically to homebrew-tap
• Removes travis and custom release scripts

What should your reviewer look out for in this PR?

{Please write here}

Check lists

• Test passed
• Coding style (indentation, etc)

Additional Comments (if any)

{Please write here}

Which issue(s) does this PR fix?

fixes #58

[mavogel]

• I tested releasing locally via curl -sL https://git.io/goreleaser | bash -s -- --skip-publish --snapshot --rm-dist and had the workflow activated for PRs as well
• I also mailed the creator on how to fully remove travis from this repo 🤔 -> solved by adapting the branch protection strategy
• BTW @khos2ow do have a windows machine around you'd test scoop?

[coveralls]

Pull Request Test Coverage Report for Build 488992556

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 75.298%

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Totals
Change from base Build 179:	0.0%
Covered Lines:	1640
Relevant Lines:	2178

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💛 - Coveralls

[arsham]

Thanks for the PR. Please add an empty line at the end of the new files.

[khos2ow]

Apology for late response, this looks great @mavogel. I have couple of nits and one specific comment down below.

[khos2ow]

Thank you @mavogel for driving this, LGTM!