[BUG] Can not fake beeing on CI with base branch main instead of master

[muuvmuuv]

Describe the bug

https://danger.systems/js/guides/the_dangerfile.html#using-danger-and-faking-being-on-a-ci

Following the instruction fails due to base branch is main and no way to change that with a flag since ci has no -b flag.

To Reproduce
Steps to reproduce the behavior:
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Expected behavior

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Your Environment

software	version
danger.js
node
npm
Operating System

Additional context
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[orta]

You're welcome to look at adding that flag 👍🏻

[fbartho]

Workaround: use danger pr <URL> instead of danger ci, at least that's what I have in our repo's troubleshooting comments :P