fix: add EOL at the end of a JSON file

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 88.23529% with 2 lines in your changes are missing coverage. Please review.

Project coverage is 87.29%. Comparing base (e4cbc03) to head (92515f9).

Files	Patch %	Lines
lib/file.ts	77.77%	2 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #137 +/- ## ========================================== + Coverage 87.24% 87.29% +0.04% ========================================== Files 18 18 Lines 886 897 +11 Branches 136 137 +1 ========================================== + Hits 773 783 +10 - Misses 113 114 +1 ```

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