fix device example name

Author: Liuchy1

README.md

@@ -301,3 +301,19 @@
         LOG.info("Error Message: " + e.getErrorMessage());
     }
 ```
+
+### Custom Client 样例
+
+> 一下片断来自项目代码里面的文件：example / cn.jpush.api.examples.DeviceExample
+```Java
+    public static void testCustomClient() {
+		ClientConfig config = ClientConfig.getInstance();
+		config.setMaxRetryTimes(5);
+		config.setConnectionTimeout(10 * 1000);// 10 seconds
+		config.setSSLVersion("TLSv1.1");
+
+		ClientConfig.setReadTimeout(ClientConfig.getInstance(), 30 * 1000);// 30 seconds
+
+		JPushClient jPushClient = new JPushClient(masterSecret, appKey, null, config);
+	}
+```

example/main/java/cn/jpush/api/examples/DevcieExample.java renamed to example/main/java/cn/jpush/api/examples/DeviceExample.java

@@ -12,8 +12,8 @@
 
 import java.util.Map;
 
-public class DevcieExample {
-	protected static final Logger LOG = LoggerFactory.getLogger(DevcieExample.class);
+public class DeviceExample {
+	protected static final Logger LOG = LoggerFactory.getLogger(DeviceExample.class);
 
 	private static final String appKey = "dd1066407b044738b6479275";
 	private static final String masterSecret = "6b135be0037a5c1e693c3dfa";