Add NLP Cloud API

Update README.md

Update README.md

Remove duplicate weatherstack entry.

 Only leave it in the Weather section.

Squash commits.

README.md

@@ -545,6 +545,7 @@ API | Description | Auth | HTTPS | CORS |
 | [Deepcode](https://www.deepcode.ai/docs/Overview%252FOverview) | AI for code review | No | Yes | Unknown |
 | [Dialogflow](https://dialogflow.com) | Natural Language Processing | `apiKey` | Yes | Unknown |
 | [Keen IO](https://keen.io/) | Data Analytics | `apiKey` | Yes | Unknown |
+| [NLP Cloud](https://nlpcloud.io) | NLP API using spaCy and transformers for NER, sentiments, classification, summarization, and more | `apiKey` | Yes | Unknown |
 | [Sentim-API](https://sentim-api.herokuapp.com) | Text sentiment analysis | No | Yes | Yes |
 | [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 |