Add missing getKline API. Fixes #8. (#9)

Co-authored-by: tiagosiebler <ts@github.com>

lib/rest-client.js

@@ -197,6 +197,15 @@ module.exports = class RestClient {
     return await this.request.get('/v2/public/orderBook/L2', params);
   }
 
+  async getKline(params) {
+    assert(params, 'No params passed');
+    assert(params.symbol, 'Parameter symbol is required');
+    assert(params.interval, 'Parameter interval is required');
+    assert(params.from, 'Parameter from is required');
+
+    return await this.request.get('/v2/public/kline/list', params);
+  }
+
   async getLatestInformation() {
     return await this.request.get('/v2/public/tickers');
   }