message: refactor: add a callback to brute force leak test
diff: var Easy = require('../lib/Easy'),
  + Curl = require('../lib/Curl'),
  readline = require('readline');
  var rl = readline.createInterface({
  @@ -36,6 +37,7 @@ function createOrCloseCurlHandles() {
  } else {
  handle = new Easy();
  handle.setOpt('HTTPPOST', postData);
  + handle.setOpt(Curl.option.XFERINFOFUNCTION, () => {});
  instances[i] = handle;
  }
  }
  