Remove Wit.ai, it's broken

README.md

@@ -1171,7 +1171,6 @@ API | Description | Auth | HTTPS | CORS |
 | [SkyBiometry](https://skybiometry.com/documentation/) | Face Detection, Face Recognition and Face Grouping | `apiKey` | Yes | Unknown |
 | [Time Door](https://timedoor.io) | A time series analysis API | `apiKey` | Yes | Yes |
 | [Unplugg](https://unplu.gg/test_api.html) | Forecasting API for timeseries data | `apiKey` | Yes | Unknown |
-| [Wit.ai](https://wit.ai/) | Natural Language Processing | `OAuth` | Yes | Unknown |
 | [WolframAlpha](https://products.wolframalpha.com/api/) | Provides specific answers to questions using data and algorithms | `apiKey` | Yes | Unknown |
 
 **[⬆ Back to Index](#index)**