switch to go modules

[problame]

• Did not attempt to keep the same versions as in Gopkg.toml

Just ran

go mod init github.com/snagles/docker-registry-manager
cd app
go build

[codecov]

Codecov Report

Merging #196 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #196   +/-   ##
=======================================
  Coverage   19.84%   19.84%           
=======================================
  Files           8        8           
  Lines         398      398           
=======================================
  Hits           79       79           
  Misses        313      313           
  Partials        6        6           

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[hacker]

This is actually essential for building, had to do that before discovering this PR.