Update add your hack button to disable when you already had a hack

[yutita]

19

[waf]

Hey, this is awesome! Thanks for contributing. The code looks good!

I see that there's a yarn.lock file in this PR, and the repo already has a package-lock.json (from npm). Did you intend to commit this? I'm happy to switch to yarn, but maybe we shouldn't have both files in the repository.

[yutita]

package-lock.json is good enough. sorry I'm using yarn for most of my project.

[waf]

Thanks again!