Update prettierrc for Windows

[zaudtke]

Describe the bug
See ThatConference/that.us#558 from That.US repo.

Windows users are unable to lint properly.

To Reproduce
Steps to reproduce the behavior:
npm run validate or npm run lint

Expected behavior
Does not fail with Error Delete 'CR'

Screenshots
See Linked issue above

Device(s)/Browser(s) this is occurring on

• OS: windows

Additional context
Added per comment in THAT.US thread.