Replacing hub

[eunjae-lee]

Should we replace hub with something else?
hub is not installed via npm.
It not natural that we have to install it separately.
(Besides, the jobs on CircleCI are failing because for some reason they're failing to install hub on CircleCI)

Initially it was to make it easy for me to ship Ship.js.
Should this be a legit alternative? https://github.com/octokit/rest.js

---

• pull request: fix: create pull request with rest api instead of hub #456
• release: fix: create github release with rest api instead of hub #458
• remove from doc: fix: remove hub #459

[jeetiss]

it will be nice

Maybe should create github bot for ship.js which will open PRs?

[uetchy]

I think we should eliminate as many as shell invocations that are basically externally dependent, and alien to the JavaScript ecosystem. rest.js is a great library to communicate with GitHub API and easy to integrate into ship.js.