Chore: add yarn.lock and package-lock.json into .gitignore just like eslint/eslint

[JounQin]

#182 (comment)

[eslint-github-bot]

Hi @JounQin!, thanks for the Pull Request

The first commit message isn't properly formatted. We ask that you update the message to match this format, as we use it to generate changelogs and automate releases.

• The length of the commit message must be less than or equal to 72

Read more about contributing to ESLint here

[eslint-github-bot]

Hi @JounQin!, thanks for the Pull Request

The first commit message isn't properly formatted. We ask that you update the message to match this format, as we use it to generate changelogs and automate releases.

• The length of the commit message must be less than or equal to 72

Read more about contributing to ESLint here

[btmills]

Since this exact change has already been made in eslint/eslint and eslint/espree, I'll use that precedent as approval for this repository as well.

[btmills]

Thanks @JounQin! Hopefully there's less friction as you're working on this repository from now on 🙂