Add completion year attribute for manga

[Valle_reading_manga]

Having a manga end date / year would be nice since the latest chapter sometimes either doesn't exist anymore or wasn't translated so far, meaning the completion date isn't clear without further "research". There's a related feature request in another forum only, so idk whether it's worth bringing it up here too, since implementing that feature would require an additional manga attribute (like "endYear") to be added in order to show it...

 

[Tristan__]

+1
full date support for start & end would be even better