Bug/fix rtd yaml

[davidorme]

Description

Fixes the build issues with poetry 1.2 on Read The Docs

Closes #116

Type of change

• New feature (non-breaking change which adds functionality)
• Optimization (back-end change that speeds up the code)
• Bug fix (non-breaking change which fixes an issue)

Key checklist

• Make sure you've run the pre-commit checks: $ pre-commit run -a
• All tests pass: $ poetry run pytest

Further checks

• Code is commented, particularly in hard-to-understand areas
• Tests added that prove fix is effective or that feature works

[codecov-commenter]

Codecov Report

Merging #119 (6d11cce) into develop (34c1181) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           develop     #119   +/-   ##
========================================
  Coverage    96.35%   96.35%           
========================================
  Files           10       10           
  Lines          412      412           
========================================
  Hits           397      397           
  Misses          15       15           

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