added coincap to cryptocurrency section

README.md

@@ -189,6 +189,7 @@ API | Description | Auth | HTTPS | CORS |
 | [CoinAPI](https://docs.coinapi.io/) | All Currency Exchanges integrate under a single api | `apiKey` | Yes | No |
 | [Coinbase](https://developers.coinbase.com) | Bitcoin, Bitcoin Cash, Litecoin and Ethereum Prices | `apiKey` | Yes | Unknown |
 | [Coinbase Pro](https://docs.pro.coinbase.com/#api) | Cryptocurrency Trading Platform | `apiKey` | Yes | Unknown |
+| [CoinCap](https://docs.coincap.io/) | Real time Cryptocurrency prices through a RESTful API | No | Yes | Unknown |
 | [CoinDesk](http://www.coindesk.com/api/) | Bitcoin Price Index | No | No | Unknown |
 | [CoinGecko](http://www.coingecko.com/api) | Cryptocurrency Price, Market, and Developer/Social Data | No | Yes | Yes |
 | [Coinigy](https://coinigy.docs.apiary.io) | Interacting with Coinigy Accounts and Exchange Directly | `apiKey` | Yes | Unknown |