Setting to prevent trailing new line in JSON

[ocadoret]

Is your feature related to a specific framework or general for this extension
JSON serialization

Is your feature request related to a problem? Please describe.
When using i18n Ally to create / edit translations, it always add a trailing new line in the JSON.
This can be a problem when using some other tools (linting or translation importing for examples).
Issue I'm having is for example :

• translation import doesn't generate a trailing new line, so it generates a git diff when editing again with i18n Ally afterward
• I have a custom lint process that checks if locales files are synch with the default locale (all keys are translated, etc.), and this linter also check that the files have the same format (wether all have a trailing new line, or none). So editing only one translation might generate a difference between files on that point.

Describe the solution you'd like
It would be nice to have a setting to deactivate the trailing new line in serialized JSON files.