Enhancement : nhentai groups

[Nega-ve]

Apologies if I'm being particular, but I see every other data point apart from groups being fetched.
it's an easy addition : [tag][group]

[AlexandreSenpai]

Hi @Nega-ve
Thank you for noticing it. I'm going to include and release it as soon as possible!

Thanks for using Enma (●'◡'●)