Added jsonlines to write comments

[haneybarg]

I need to colect one thousand comments per vid and write them into a jsonlines, so I did two things:

• Added jsonlines to append to comments.jsonl file, with id, author and comment.
• Interrupted the code after 10 pages, assuming that I would put 100 comments per page in the arguments.
  This is not an optimization, it is a slight modification to those who wish to use jsonlines.