fix(config): send sample every 120 secs

Author: gergelyke

lib/config.js

@@ -2,7 +2,7 @@ var path = require('path');
 
 var config = {};
 
-config.collectInterval = 10 * 1000;
+config.collectInterval = 120 * 1000;
 config.sampleSize = 60;
 
 config.collectorApi = 'http://trace-collector-api.risingstack.com';