readthedocs documentation isn't being build anymore

[reinout]

Oops, I should have listened to the emails telling me something was changing :-) I need to add a rtd configuration file.

@mauritsvanrees: https://readthedocs.org/projects/zestreleaser/builds/19426217/

[reinout]

@elisallenens, thanks for finding the problem.

[reinout]

Fixed! https://zestreleaser.readthedocs.io/en/latest/changelog.html Fixed by adding a .readthedocs.yml.