Add doc for custom Error

- Add NPM badge
- Update basic example

Author: masterT

README.md

@@ -2,6 +2,7 @@
 
 > A simple way to structure your web scraper.
 
+[![npm version](https://badge.fury.io/js/yolo-scraper.svg)](https://badge.fury.io/js/yolo-scraper)
 [![Build Status](https://travis-ci.org/masterT/yolo-scraper.svg?branch=master)](https://travis-ci.org/masterT/yolo-scraper)
 [![Dependency Status](https://gemnasium.com/badges/github.com/masterT/yolo-scraper.svg)](https://gemnasium.com/github.com/masterT/yolo-scraper)
 
@@ -74,6 +75,14 @@ scraper('masterT', function (error, data) {
 
 ## documentation
 
+### `ValidationError`
+
+_Error_ instance with additional _Object_ property `errorObjects` which content all the error information, see [ajv error](https://github.com/epoberezkin/ajv#error-objects).
+
+### `ListValidationError`
+
+_Error_ instance with additional _Array_ property `validationError` of `ValidationError` instance.
+
 ### `createScraper(options)`
 
 Returned a scraper function defined by the `options`.

examples/basic.js

@@ -37,6 +37,9 @@ var scraper = yoloScraper.createScraper({
 
 
 scraper('masterT', function (error, data) {
-  console.log('error:', error);
-  console.log('data:', data);
+  if (error) {
+    console.log('error:', error);
+  } else {
+    console.log('data:', data);
+  }
 });