Change README, delete privileged. (#2)

* Update README

Author: summershrimp

README.md

@@ -4,7 +4,7 @@ A docker image to hold pwn challenges in ctf war
 # Introduction
 This image contains xinetd to provide remote access services for pwn challenges, and also contains tcpdump to dump network traffics into pcap file.
 
-Notice: we use a modified xinetd version from our team to restrict syscalls called by xinetd services. In order to use this feature, docker container must run with `--privileged` option.
+Notice: we use a modified xinetd version from our team to restrict syscalls called by xinetd services. ~~In order to use this feature, docker container must run with `--privileged` option.~~ No more `--privileged` needed now.
 
 
 # Usage

README.zh-CN.md

@@ -5,7 +5,7 @@
 这个镜像中包括了运行PWN题目的xinetd服务和用于记录流量的tcpdump服务。
 
 注意: 我们使用了修改版的[xinetd](https://github.com/Asuri-Team/xinetd-kafel). 在这个版本的xinetd中，可以很方便的限制服务所可以调用的系统调用。
-为了使用这一功能，在开启docker容器的时候必须添加`--privileged`选项。
+~~为了使用这一功能，在开启docker容器的时候必须添加`--privileged`选项。~~ 现已无需`--privileged`选项。
 
 # 用法
 查看Dockerfile.example了解更多