bug: files are missing final newlines

[lucperkins]

Describe the bug

Many linters and related tools expect newlines at the end of files. As far as I can tell, ts-rs does not add one to generated .ts files, which I wouldn't necessarily classify as a bug but I think that it's more surprising to not have one than to have one.

To Reproduce

Generate any new .ts files.

Expected behavior

Generated .ts files have a newline at the end.

Screenshots

N/A

Version

8.1.0

Additional context

N/A