Replace dep with go modules

[condemil]

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Summary

This PR fixes/implements the following bugs/features

• Replace dep with go modules

Closing issues

Fixes #35

Checklist

• Have you followed the guidelines in our CONTRIBUTING guide?
• Have you fmt your code locally prior to submission (orbit run fmt)?
• Have you written new tests for your core changes, as applicable?
• Have you successfully ran tests with your changes locally (orbit run ci)?
• I have squashed any insignificant commits
• This change has comments for package types, values, functions, and non-obvious lines of code

[codecov]

Codecov Report

Merging #37 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #37   +/-   ##
=======================================
  Coverage   94.48%   94.48%           
=======================================
  Files           7        7           
  Lines         254      254           
=======================================
  Hits          240      240           
  Misses          7        7           
  Partials        7        7

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[gulien]

Hello @condemil

Thank you for this PR.

You should also update the Golang version in .travis.yml, appveyor.yml and .github/CONTRIBUTING.md to 1.13. In the go.mod file, also add go 1.13 👍

Also, you should update the fmt task by adding go mod tiny.