Update circleci/golang Docker tag to v1.14

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
circleci/golang	docker	minor	1.13 -> 1.14

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[codecov]

Codecov Report

Merging #9 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master       #9   +/-   ##
=======================================
  Coverage   70.69%   70.69%           
=======================================
  Files           7        7           
  Lines         389      389           
=======================================
  Hits          275      275           
  Misses         90       90           
  Partials       24       24           

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