{
  "fontawesome4": "https://maxcdn.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css",
  "fontawesome5": "https://use.fontawesome.com/releases/v5.0.7/js/all.js",
  "iconic": "https://cdnjs.cloudflare.com/ajax/libs/open-iconic/1.1.1/font/css/open-iconic.min.css",
  "ionicons": "https://code.ionicframework.com/ionicons/2.0.1/css/ionicons.min.css",
  "mdi": "https://cdn.materialdesignicons.com/2.1.19/css/materialdesignicons.min.css"
}

{
  "fontawesome4": "https://maxcdn.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css",
  "fontawesome5": "https://use.fontawesome.com/releases/v5.1.0/js/all.js",
  "iconic": "https://cdnjs.cloudflare.com/ajax/libs/open-iconic/1.1.1/font/css/open-iconic.min.css",
  "ionicons": "https://code.ionicframework.com/ionicons/2.0.1/css/ionicons.min.css",
  "mdi": "https://cdn.materialdesignicons.com/2.1.19/css/materialdesignicons.min.css"
}

Update to the latest version of Font Awesome
Update to the latest version of Font Awesome

Font Awesome recently updated from 5.0.7 to 5.1. I've updated this to reflect that change.