Added Unplugg Automated Forecasting API

Added to Machine Learning

README.md

@@ -262,6 +262,7 @@ For information on contributing to this project, please see the [contributing gu
 |---|---|---|---|---|
 | Clarifai | Computer Vision | `OAuth` | Yes | [Go!](https://developer.clarifai.com/) |
 | Cleverbot | Web chat bot | `apikey` | Yes | [Go!](https://www.cleverbot.com/api/) |
+| Unplugg | Forecasting API for timeseries data | `apikey` | Yes | [Go!](http://unplu.gg/test_api.html) |
 | Wit.ai | Natural Language Processing | `OAuth` | Yes | [Go!](https://wit.ai/) |
 
 ### Math