Update 64.15.1. Use Jetty 8 with Maven.md

IX. ‘How-to’ guides/64.15.1. Use Jetty 8 with Maven.md

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+### 64.15.1. 通过Maven使用Jetty8
+
+如果正在使用starter pom和parent，你只需添加Jetty starter，去掉WebSocket依赖，并改变version属性，比如，对于一个简单的webapp或service：
+```xml
+<properties>
+    <jetty.version>8.1.15.v20140411</jetty.version>
+    <jetty-jsp.version>2.2.0.v201112011158</jetty-jsp.version>
+</properties>
+<dependencies>
+    <dependency>
+        <groupId>org.springframework.boot</groupId>
+        <artifactId>spring-boot-starter-web</artifactId>
+        <exclusions>
+            <exclusion>
+                <groupId>org.springframework.boot</groupId>
+                <artifactId>spring-boot-starter-tomcat</artifactId>
+            </exclusion>
+        </exclusions>
+    </dependency>
+    <dependency>
+        <groupId>org.springframework.boot</groupId>
+        <artifactId>spring-boot-starter-jetty</artifactId>
+        <exclusions>
+            <exclusion>
+                <groupId>org.eclipse.jetty.websocket</groupId>
+                <artifactId>*</artifactId>
+            </exclusion>
+        </exclusions>
+    </dependency>
+</dependencies>
+```