Support a threshold of 0

Closes #77

Author: sindresorhus

lib/output.js

@@ -75,7 +75,7 @@ function getReporter(format) {
 module.exports = function (parameters, response) {
   return Promise.resolve().then(function () {
     var renderer = getReporter(parameters.format);
-    var threshold = parameters.threshold || THRESHOLD;
+    var threshold = typeof parameters.threshold === 'number' ? parameters.threshold : THRESHOLD;
     var optimizedResourceURL = RESOURCE_URL + querystring.stringify({url: response.id, strategy: parameters.strategy});
 
     console.log(renderer(