feat: switch from dep to go mod

[mavogel]

What does this do / why do we need it?

Switches to go modules from dep

How this PR fixes the problem?

Updates to the latest golang version and unifies the PRs

• refactor(deps): use go mod #71
• Apply gomod from gopkg #64

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?

[coveralls]

Pull Request Test Coverage Report for Build 175

• 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 75.185%

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Totals
Change from base Build 155:	0.0%
Covered Lines:	1630
Relevant Lines:	2168

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💛 - Coveralls

[khos2ow]

Nit: since vendor is removed maybe add it to .gitignore, otherwise LGTM.

[mavogel]

Travis passes but status is not reported back. Will address in #58