Merge pull request #21 from ianstormtaylor/update-readme-error

add error to verb readme

Author: jonschlinkert

.verb.md

@@ -57,6 +57,9 @@ kindOf(/foo/);
 kindOf(new RegExp('foo'));
 //=> 'regexp'
 
+kindOf(new Error('error'));
+//=> 'error'
+
 kindOf(function () {});
 //=> 'function'