Remove broken links from Plino and Sentim-API

The links https://plino.herokuapp.com and https://sentim-api.herokuapp.com were broken

README.md

@@ -285,7 +285,6 @@ API | Description | Auth | HTTPS | CORS |
 | [Nationalize.io](https://nationalize.io) | Estimate the nationality of a first name | No | Yes | Yes |
 | [OOPSpam](https://oopspam.com/) | Multiple spam filtering service | No | Yes | Yes |
 | [PageCDN](https://pagecdn.com/docs/public-api) | Public API for javascript, css and font libraries on PageCDN | `apiKey` | Yes | Yes |
-| [Plino](https://plino.herokuapp.com/) | Spam filtering system | No | Yes | Unknown |
 | [Postman](https://docs.api.getpostman.com/) | Tool for testing APIs | `apiKey` | Yes | Unknown |
 | [ProxyCrawl](https://proxycrawl.com) | Scraping and crawling anticaptcha service | `apiKey` | Yes | Unknown |
 | [Public APIs](https://github.com/davemachado/public-api) | A collective list of free JSON APIs for use in web development | No | Yes | Unknown |
@@ -579,7 +578,6 @@ API | Description | Auth | HTTPS | CORS |
 | [Dialogflow](https://dialogflow.com) | Natural Language Processing | `apiKey` | Yes | Unknown |
 | [EXUDE-API](http://uttesh.com/exude-api/) | Used for the primary ways for filtering the stopping, stemming words from the text data | No | Yes | Yes |
 | [Keen IO](https://keen.io/) | Data Analytics | `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 |
 | [Wit.ai](https://wit.ai/) | Natural Language Processing | `OAuth` | Yes | Unknown |