Replace dead inqstats api by population.io api (#702)

* Replace dead inqstats by population.io api

* Update microlink information (#698)

README.md

@@ -519,10 +519,10 @@ API | Description | Auth | HTTPS | CORS | Link |
 | Enigma Public | Broadest collection of public data | `apiKey` | Yes | Yes | [Go!](http://docs.enigma.com/public/public_v20_api_about) |
 | fonoApi | Mobile Device Description | No | Yes | Unknown | [Go!](https://fonoapi.freshpixl.com/) |
 | French Address Search | Address search via the French Government | No | Yes | Unknown | [Go!](https://adresse.data.gouv.fr/api) |
-| INQStats | Open demographic data such as population, life expectancy, migration rate, etc | `apiKey` | No | Unknown | [Go!](http://blog.inqubu.com/inqstats-open-api-published-to-get-demographic-data) |
 | LinkPreview | Get JSON formatted summary with title, description and preview image for any requested URL | `apiKey` | Yes | Yes | [Go!](https://www.linkpreview.net) |
 | Marijuana Strains | Marijuana strains, races, flavors, and effects | `apiKey` | No | Unknown | [Go!](http://strains.evanbusse.com/) |
 | Microlink.io | Extract structured data from any website | No | Yes | Yes | [Go!](https://microlink.io) |
+| Population.io | Open demographic data such as population tables, population rank and life expectancy | No | No | Unknown | [Go!](http://api.population.io/) |
 | Quandl | Stock Market Data | No | Yes | Unknown | [Go!](https://www.quandl.com/) |
 | Scoop.it | Content Curation Service | `apiKey` | No | Unknown | [Go!](http://www.scoop.it/dev) |
 | Teleport | Quality of Life Data | No | Yes | Unknown | [Go!](https://developers.teleport.org/) |