Chrome extension to list PRs that will change a file that you are looking at

Writing down some thoughts, links

- https://developer.github.com/v3/pulls/#list-pull-requests-files
- `GET /repos/:owner/:repo/pulls/:number/files`
- just need to extract the filename
- can filter by status

`curl https://api.github.com/repos/babel/babel/pulls/5061/files`

- show name/pr title/link!

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Or the other way around, we make a service that tracks all prs and whenever they update it will update which files are updated.

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Also could run this on PRs to show other PRs that are also changing the same files
- might be interesting to do this before creating one too
- https://twitter.com/zpao/status/817188556934262784