Calendar versioning sorts dates incorrectly

[Zopolis4]

On https://release-monitoring.org/project/372508/, 20161024 is listed as a more recent version than 20170531, despite the project using the Calendar version scheme.

[Zlopez]

The Version pattern wasn't filled, so it just guessed what calendar format the version is. After editing the project and filling the version pattern it started sorting the versions correctly.