✏️ Fix comma typo in README.md

[miwashutaro0611]

Description

• There is a typo in the README.md and it has been corrected, so please check if it is OK.
  • Commas were misplaced in the example description of package.json in README.md.

I didn't create an issue for fixing typos

Tests

• All tests passed.

[carloscuesta]

Thanks!

[codecov]

Codecov Report

Base: 93.08% // Head: 93.08% // No change to project coverage 👍

Coverage data is based on head (88018ad) compared to base (51f040f).
Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #922   +/-   ##
=======================================
  Coverage   93.08%   93.08%           
=======================================
  Files          29       29           
  Lines         246      246           
  Branches       52       52           
=======================================
  Hits          229      229           
  Misses         17       17           

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