Update Discord link to new domain

discordapp.com -> discord.com

README.md

@@ -730,7 +730,7 @@ API | Description | Auth | HTTPS | CORS |
 | [Buffer](https://buffer.com/developers/api) | Access to pending and sent updates in Buffer | `OAuth` | Yes | Unknown |
 | [Carro Score](https://docs.score.getcarro.com/) | Social Media Influence Rating | `apiKey` | Yes | Yes |
 | [Cisco Spark](https://developer.ciscospark.com) | Team Collaboration Software | `OAuth` | Yes | Unknown |
-| [Discord](https://discordapp.com/developers/docs/intro) | Make bots for Discord, integrate Discord onto an external platform | `OAuth` | Yes | Unknown |
+| [Discord](https://discord.com/developers/docs/intro) | Make bots for Discord, integrate Discord onto an external platform | `OAuth` | Yes | Unknown |
 | [Disqus](https://disqus.com/api/docs/auth/) | Communicate with Disqus data | `OAuth` | Yes | Unknown |
 | [Facebook](https://developers.facebook.com/) | Facebook Login, Share on FB, Social Plugins, Analytics and more | `OAuth` | Yes | Unknown |
 | [Foursquare](https://developer.foursquare.com/) | Interact with Foursquare users and places (geolocation-based checkins, photos, tips, events, etc) | `OAuth` | Yes | Unknown |