[plugins.json] Add cocoapods-art

[Dan Feldman]

Please add the following entry to the plugins.json file:

{
  "gem": "cocoapods-art",
  "name": "CocoaPods Artifactory Plugin",
  "author": "Dan Feldman",
  "url": "https://github.com/JFrogDev/cocoapods-art",
  "description": "Artifactory support for CocoaPods"
}

[Orta Therox]

Awesome, please send a PR adding this 👍

[Dan Feldman]

Cheers @orta , here it is: #74

[Orta Therox]

Coolbeans