Document how to avoid redundant newline at the end of `.copier-answers.yml`.

Is your feature request related to a problem? Please describe.

Currently, there is a redundant newline at the end of the generated .copier-answers.yml which violate the hook end-of-file-fixer in pre-commit-hook.

Describe the solution you’d like

No redundant newline at the end of .copier-answers.yml.

Describe alternatives you’ve considered

N/A

Additional context

I tried to find the related code but failed, if with guidance, I am willing to fix this tiny issue if confirmed.

[yajo]

Have you tried adding a - character at the end of the Jinja expression?

# Changes here will be overwritten by Copier
{{ _copier_answers|to_nice_yaml -}}

[yajo]

The lack of that instruction is not a bug. It’s just something that will produce a file with 2 empty lines at the end, which is most likely not what you want, but is not really an invalid yaml file.

So, you can leave all the code and tests as they are. Just update the docs and readme.