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coverage: 99.397%. remained the same
when pulling 49888e43cc433239330cb5444377c3e9b6113356 on build/readthedocs.yaml
into ec153761dcfdf67451d5e6db33ee8e76d1b9f3a1 on master.
As explained on https://readthedocs.org/projects/yamllint/:
https://blog.readthedocs.com/migrate-configuration-v2/