Update latest monthly hiring post ids (December 2020)

[donnemartin]

Ask HN: Who is hiring? https://news.ycombinator.com/item?id=TBD

Ask HN: Freelancer? Seeking freelancer? https://news.ycombinator.com/item?id=TBD

Ask HN: Who wants to be hired? https://news.ycombinator.com/item?id=TBD

If you'd like to contribute on a bite-sized issue, feel free to submit a pull request for next month's set of hiring post ids.

Check out these PRs as a reference:

• https://github.com/donnemartin/haxor-news/pull/23
• https://github.com/donnemartin/haxor-news/pull/49
• https://github.com/donnemartin/haxor-news/pull/64

"Ask HN: Who wants to be hired?" isn't hooked up yet.