update version in readme

README.md

@@ -24,12 +24,12 @@ Add dependencies to your pom.xml:
 		<dependency>
             <groupId>us.codecraft</groupId>
             <artifactId>webmagic-core</artifactId>
-            <version>0.4.0</version>
+            <version>0.4.1</version>
         </dependency>
 		<dependency>
             <groupId>us.codecraft</groupId>
             <artifactId>webmagic-extension</artifactId>
-            <version>0.4.0</version>
+            <version>0.4.1</version>
         </dependency>
 
 ## Get Started:

zh_docs/README.md

@@ -34,12 +34,12 @@ webmagic使用maven管理依赖，在项目中添加对应的依赖即可使用w
 		<dependency>
             <groupId>us.codecraft</groupId>
             <artifactId>webmagic-core</artifactId>
-            <version>0.4.0</version>
+            <version>0.4.1</version>
         </dependency>
 		<dependency>
             <groupId>us.codecraft</groupId>
             <artifactId>webmagic-extension</artifactId>
-            <version>0.4.0</version>
+            <version>0.4.1</version>
         </dependency>
 
 #### 项目结构