Fix code typo (style/styles).

[millette]

What kind of change does this PR introduce?

• bugfix
• feature
• refactoring / style
• build / chore
• documentation

Did you add tests for your changes?

• Yes, my code is well tested
• Not relevant

If relevant, did you update the documentation?

• Yes, I've updated the documentation
• Not relevant

Summary

Noticed what appears like a typo in the code.

[codecov]

Codecov Report

Merging #625 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master     #625   +/-   ##
=======================================
  Coverage   99.01%   99.01%           
=======================================
  Files           3        3           
  Lines         204      204           
  Branches       59       59           
=======================================
  Hits          202      202           
  Misses          2        2

Impacted Files	Coverage Δ
src/index.js	99.41% <100%> (ø)	⬆️

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[ghost]

Good find... double checked it and your right.