fix issues/37

README.md

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+常见 CDN 的 cname 库，配合 [https://github.com/zu1k/nali](https://github.com/zu1k/nali) 使用。
+
+## 效果
+nslookup 默认效果
+```bash
+nslookup www.baidu.com 114.114.114.114
+Server:		114.114.114.114
+Address:	114.114.114.114#53
+
+Non-authoritative answer:
+www.baidu.com	canonical name = www.a.shifen.com.
+Name:	www.a.shifen.com
+Address: 220.181.38.150
+Name:	www.a.shifen.com
+Address: 220.181.38.149
+```
+
+叠加 `nali` 后效果
+```bash
+nslookup www.baidu.com 114.114.114.114 | nali
+Server:		114.114.114.114 [114DNS.COM 114DNS.COM]
+Address:	114.114.114.114 [114DNS.COM 114DNS.COM] #53
+
+Non-authoritative answer:
+www.baidu.com	canonical name = www.a.shifen.com [百度旗下业务地域负载均衡系统] .
+Name:	www.a.shifen.com [百度旗下业务地域负载均衡系统]
+Address: 220.181.38.149 [中国 北京 北京]
+Name:	www.a.shifen.com [百度旗下业务地域负载均衡系统]
+Address: 220.181.38.150 [中国 北京 北京]
+```
+
+更多用法见 [https://github.com/zu1k/nali](https://github.com/zu1k/nali)