Added NSFW R34 Site

[Ashrick12]

Added a rule34 site to data.json and sites.md

  "Rule34Paheal": {
    "errorMsg": "If you typed the ID by hand, try again; if you came from a link on this site, it might be bug report time...",
    "errorType": "message",
    "isNSFW": true,
    "url": "https://rule34.paheal.net/user/{}",
    "urlMain": "https://rule34.paheal.net/",
    "username_claimed": "John",
    "username_unclaimed": "noonewouldeverusethis778"
  },

1. ![](https://www.google.com/s2/favicons?domain=https://rule34.paheal.net/) [Rule34](https://rule34.paheal.net/) **(NSFW)**

Resolves #2018

[Spacellary]

Resolves #2018

That issue isn't specific about this website, but this is a good addition!