CircleCI nightly job is broken

[MikeMcC399]

Issue

The CircleCI job which is linked to by https://github.com/yarnpkg/yarn/blob/master/README.md runs nightly and fails nightly.

See https://app.circleci.com/pipelines/github/yarnpkg/yarn

The badge also fails to show the status:

<a href="https://circleci.com/gh/yarnpkg/yarn"><img alt="Circle Status" src="https://circleci.com/gh/yarnpkg/yarn.svg?style=shield&circle-token=5f0a78473b0f440afb218bf2b82323cc6b3cb43f"></a>

Suggestion

Either disable the job and remove the badge OR update the job so it runs successfully and update the badge link, for example:

using Markdown syntax:

[![Circle Status](https://circleci.com/gh/yarnpkg/yarn/tree/master.svg?style=svg)](https://circleci.com/gh/yarnpkg/yarn/tree/master)