LinuxServer Changes:
Rebasing to alpine 3.13.
mylar3 Changes:
IMP: added folder.jpg option in GUI which will download a thumbnail cover from CV, IMP: generation of series.json file which contains series metadata is now possible, IMP: description for a series will now be shown on series detail page if available, FIX: publication date would sometimes take the wrong issue (and thereby date) when deciding when a series has ended