update doc

Author: fivesmallq

README.md

@@ -81,7 +81,7 @@ more method
     @Test
     public void testToMapList() throws Exception {
         //split param must implements ListableExtractor
-        List<Map<String, String>> languages = Extractors.on(listHtml).split(selector("tr.item.html"))
+        List<Map<String, String>> languages = Extractors.on(listHtml).split(jerry("tr.item.html"))
                 .extract("type", selector("td.type"))
                 .extract("name", selector("td.name"))
                 .extract("url", selector("td.url"))
@@ -117,7 +117,7 @@ more method
 ````java
     @Test
     public void testToBeanList() throws Exception {
-        List<Language> languages = Extractors.on(listHtml).split(selector("tr.item.html"))
+        List<Language> languages = Extractors.on(listHtml).split(jerry("tr.item.html"))
                 .extract("type", selector("td.type"))
                 .extract("name", selector("td.name"))
                 .extract("url", selector("td.url"))