[Request] Support changes for (hentai-**) and (porn-**) websites

[trollmoon-8bit]

The website structure has same structures from old link on this issues :
https://github.com/mikf/gallery-dl/issues/288

The link was change is this website :

https://porn-image-xxx.com
https://hentai-image.com
https://hentai-cosplay.com

This is the new link from that website :

https://porn-image.com
https://hentai-img-xxx.com
https://hentai-cosplay-xxx.com

For "hentai-cosplay-xxx" website, its already been updated on gallery-dl. But the other link such as "porn-image" and "hentai-img-xxx" hasn't been updated yet. Website that needed to be updated on gallery-dl is "porn-image" and "hentai-img-xxx".

I already tried the other link on that old issues, but not works anymore. But for now, that 3 websites is new websites that still working right now.

Thank you for make this library.
Sorry for my bad english.