Add Zone walking NSEC module

Author: shmilylty

README.md

@@ -30,7 +30,7 @@
 
 * **收集能力强大**，详细模块请阅读[收集模块说明](https://github.com/shmilylty/OneForAll/tree/master/docs/collection_modules.md)。
   1. 利用证书透明度收集子域（目前有6个模块：`censys_api`，`certspotter`，`crtsh`，`entrust`，`google`，`spyse_api`）
-  2. 常规检查收集子域（目前有4个模块：域传送漏洞利用`axfr`，检查跨域策略文件`cdx`，检查HTTPS证书`cert`，检查内容安全策略`csp`，检查robots文件`robots`，检查sitemap文件`sitemap`，后续会添加检查NSEC记录，NSEC3记录等模块）
+  2. 常规检查收集子域（目前有4个模块：域传送漏洞利用`axfr`，检查跨域策略文件`cdx`，检查HTTPS证书`cert`，检查内容安全策略`csp`，检查robots文件`robots`，检查sitemap文件`sitemap`，利用NSEC记录遍历DNS域`dnssec`，后续会添加NSEC3记录等模块）
   3. 利用网上爬虫档案收集子域（目前有2个模块：`archivecrawl`，`commoncrawl`，此模块还在调试，该模块还有待添加和完善）
   4. 利用DNS数据集收集子域（目前有23个模块：`binaryedge_api`, `bufferover`, `cebaidu`, `chinaz`, `chinaz_api`, `circl_api`, `dnsdb_api`, `dnsdumpster`, `hackertarget`, `ip138`, `ipv4info_api`, `netcraft`, `passivedns_api`, `ptrarchive`, `qianxun`, `rapiddns`, `riddler`, `robtex`, `securitytrails_api`, `sitedossier`, `threatcrowd`, `wzpc`, `ximcx`）
   5. 利用DNS查询收集子域（目前有5个模块：通过枚举常见的SRV记录并做查询来收集子域`srv`，以及通过查询域名的DNS记录中的MX,NS,SOA,TXT记录来收集子域）

docs/en-us/README.md

@@ -33,7 +33,7 @@ At present, OneForAll is still under development, there must be a lot of problem
 
 * **Powerful collection capability**，For more information, please see [collection module description](https://github.com/shmilylty/OneForAll/tree/master/docs/collection_modules.md).
 1. Collect subdomains using certificate transparency (there are currently 6 modules: `censys_api`，`certspotter`，`crtsh`，`entrust`，`google`，`spyse_api`）
-2. General check collection subdomains (there are currently 4 modules: domain transfer vulnerability exploitation`axfr`, cross-domain policy file `cdx`, HTTPS certificate `cert`, content security policy `csp`, robots file `robots`, and sitemap file `sitemap`. Check NSEC record, NSEC3 record and other modules will be added later).
+2. General check collection subdomains (there are currently 4 modules: domain transfer vulnerability exploitation`axfr`, cross-domain policy file `cdx`, HTTPS certificate `cert`, content security policy `csp`, robots file `robots`, and sitemap file `sitemap`, Zone walking NSEC module `nsec`. Check NSEC3 record and other modules will be added later).
 3. Collect subdomains using web crawler files (there are currently 2 modules: `archirawl`, `commoncrawl`, which is still being debugged and needs to be added and improved). 
 4. Collect subdomains using DNS datasets (there are currently 23 modules: `binaryedge_api`, `bufferover`, `cebaidu`, `chinaz`, `chinaz_api`, `circl_api`, `dnsdb_api`, `dnsdumpster`, `hackertarget`, `ip138`, `ipv4info_api`, `netcraft`, `passivedns_api`, `ptrarchive`, `qianxun`, `rapiddns`, `riddler`, `robtex`, `securitytrails_api`, `sitedossier`, `threatcrowd`, `wzpc`, `ximcx`）
 5. Collect subdomains using DNS queries (There are currently 5 modules: collecting subdomains `srv` by enumerating common SRV records and making queries, and collecting subdomains by querying MX,NS,SOA,TXT records in DNS records of domain names).