Upgrade stretchr/testify

[ymohl-cl]

Hello,

I am working at Manomano and we use gemnasium analyser to report securities issues.

We use zap logger and goleak is a dependency of zap.logger.
This little pr purpose you to update your yaml dependency to a fixed version.
Detail report:
| Severity | Unknown |
| Identifier | |
| URL | docker/cli#2117 |
| Scanner | Gemnasium |
| Message | XML Entity Expansion in gopkg.in/yaml.v2 |
| Package | gopkg.in/yaml.v2 v2.2.1 |
| Solution | Upgrade to version 2.2.3 or above. |
| File | go.sum |

[CLAassistant]

All committers have signed the CLA.

[codecov]

Codecov Report

Merging #59 (c728079) into master (d36f3ae) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #59   +/-   ##
=======================================
  Coverage   93.27%   93.27%           
=======================================
  Files           4        4           
  Lines         119      119           
=======================================
  Hits          111      111           
  Misses          5        5           
  Partials        3        3           

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[abhinav]

Hey there! Thanks for the PR. Please sign the CLA and we'll be able to merge this change.

[ymohl-cl]

done thanks !