RFC: Add a newline to the end of the generated package-lock.json

[melink14]

By default, npm puts a newline at the end of package-lock.json but when npm-force-resolutions rewrites the file, it does not include a final newline.

This is not a major problem but it does trigger my linters since it's unexpected.

[dnicolson]

Tabs are also converted to spaces, making diffs difficult to read if the package-lock.json file was not already using spaces.