Merge pull request #612 from shakyink/feature/more_crypto_apis

Update - add some more crypto apis

README.md

@@ -149,8 +149,11 @@ API | Description | Auth | HTTPS | CORS | Link |
 ### Cryptocurrency
 API | Description | Auth | HTTPS | CORS | Link |
 |---|---|---|---|---|---|
+| Binance | Exchange for Trading Cryptocurrencies based in China | `apiKey` | Yes | Unknown | [Go!](https://github.com/binance-exchange/binance-official-api-docs) |
 | BitcoinCharts | Financial and Technical Data related to the Bitcoin Network | No | Yes | Unknown | [Go!](https://bitcoincharts.com/about/exchanges/) |
 | Bitfinex | Cryptocurrency Trading Platform | `apiKey` | Yes | Unknown | [Go!](https://docs.bitfinex.com/docs/introduction) |
+| Bitmex | Real-Time Cryptocurrency derivatives trading platform based in Hong Kong | `apiKey` | Yes | Unknown | [Go!](https://www.bitmex.com/app/apiOverview) |
+| Bittrex | Next Generation Crypto Trading Platform | `apiKey` | Yes | Unknown | [Go!](https://bittrex.com/Home/Api) |
 | Block | Bitcoin Payment, Wallet & Transaction Data | `apiKey` | Yes | Unknown | [Go!](https://www.block.io/docs/basic) |
 | Blockchain | Bitcoin Payment, Wallet & Transaction Data | No | Yes | Unknown | [Go!](https://www.blockchain.info/api) |
 | CoinAPI | All Currency Exchanges integrate under a single api | `apiKey` | Yes | No | [Go!](https://docs.coinapi.io/) |