don't use test.bind

Author: Michael Hayes

lib/results.js

@@ -4,7 +4,7 @@ var through = require('through');
 var resumer = require('resumer');
 var inspect = require('object-inspect');
 var hasOwn = Object.prototype.hasOwnProperty;
-var invalidYaml = RegExp.prototype.test.bind(/\:|\-|\?/);
+var yamlIndicators = /\:|\-|\?/;
 var nextTick = typeof setImmediate !== 'undefined'
     ? setImmediate
     : process.nextTick
@@ -188,3 +188,7 @@ function getNextTest (results) {
 function has (obj, prop) {
     return hasOwn.call(obj, prop);
 }
+
+function invalidYaml (str) {
+  return yamlIndicators.test(str);
+}