fix: override with empty string

[unional]

No description provided.

[codecov-io]

Codecov Report

Merging #28 into master will not change coverage.
The diff coverage is 100%.

@@          Coverage Diff          @@
##           master    #28   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files           3      3           
  Lines          25     25           
  Branches        7      7           
=====================================
  Hits           25     25

Impacted Files	Coverage Δ
src/required.ts	100% <100%> (ø)	⬆️

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[coveralls]

Coverage remained the same at 100.0% when pulling 8155f36 on empty-string into 093621b on master.

[unional]

🎉 This PR is included in version 0.6.2 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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