readthedocs Fix

[bernardopacini]

Purpose

This fixes readthedocs after the docs build broke in the transition from Travis to GH Actions

Type of change

Maintenance update. Select the appropriate type(s) that describe this PR

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (non-backwards-compatible fix or feature)
• Code style update (formatting, renaming)
• Refactoring (no functional changes, no API changes)
• Documentation update X Other (please describe)

Testing

Explain the steps needed to test the new code to verify that it does indeed address the issue and produce the expected behavior.

Checklist

Put an x in the boxes that apply.

• [ ] I have run unit and regression tests which pass locally with my changes
• [ ] I have added new tests that prove my fix is effective or that my feature works
• [ ] I have added necessary documentation

[coveralls]

Pull Request Test Coverage Report for Build 611628681

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 87.491%

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Totals
Change from base Build 593052013:	0.0%
Covered Lines:	3728
Relevant Lines:	4261

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💛 - Coveralls

[ewu63]

FYI builds are working: https://readthedocs.org/projects/openconcept/builds/ but for some reason not being displayed as a status check.