Koromo multiple artists

[siliconfeces]

If the koromo plugin is run on an info.json where the artist field is actually an array you'd get a garbage artist tag (artist:ARRAY-blabla). I'm not sure if it's because of an update to koromo, or if it's because it's a format mixup since info.json is apparently a very popular filename.

This fixes this by allowing the artist field to be an array. Another way would be to return an error instead, but eh whatever.

[Difegue]

Looks good, merging this! The koromo plugin has historically been used with a ton of other info.jsons since it has one of the most "normalized" formats. It makes sense to try and make it as functional as possible.
I feel like I should rename it at some point to "catchall info.json plugin that might work for you" or something similar...

[Difegue]

Holopin made their bot workflow available to individual users so I don't have to issue holobytes and meme badges by making direct API calls anymore, let's try it!

@holopin-bot @siliconfeces holobyte

[holopin-bot]

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