Update README.md

Author: Berkantdemirci

README.md

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    * https://github.com/WangYihang/Webshell-Sniper A webshell manager via terminal
    * https://github.com/nil0x42/phpsploit PhpSploit - Full-featured C2 framework which silently persists on webserver via evil PHP oneliner
    * https://webhint.io/ - webhint - webhint is a customizable linting tool that helps you improve your site's accessibility, speed, cross-browser compatibility, and more by checking your code for best practices and common errors.
+   * https://gtfobins.github.io/ - gtfobins - GTFOBins is a curated list of Unix binaries that can be used to bypass local security restrictions in misconfigured systems.
    * https://github.com/HightechSec/git-scanner git-scanner - A tool for bug hunting or pentesting for targeting websites that have open `.git` repositories available in public
 
 ## Cheat Sheets
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    * https://www.elearnsecurity.com/course/web_application_penetration_testing_extreme/ eLearnSecurity Web Application Penetration Testing eXtreme
    * https://www.offensive-security.com/information-security-training/advanced-web-attack-and-exploitation/ Offensive Security Advanced Web Attacks and Exploitation (live)
    * https://www.sans.org/course/web-app-penetration-testing-ethical-hacking Sans SEC542: Web App Penetration Testing and Ethical Hacking
-   * https://www.sans.org/course/advanced-web-app-penetration-testing-ethical-hacking Sans SEC642: Advanced Web App Penetration Testing and Ethical Hacking   * http://opensecuritytraining.info/ - Open Security Training
+   * https://www.sans.org/course/advanced-web-app-penetration-testing-ethical-hacking Sans SEC642: Advanced Web App Penetration Testing and Ethical Hacking   
+   * http://opensecuritytraining.info/ - Open Security Training
    * http://securitytrainings.net/security-trainings/ - Security Exploded Training
    * http://www.cs.fsu.edu/~redwood/OffensiveComputerSecurity/ - FSU - Offensive Computer Security
    * http://www.cs.fsu.edu/~lawrence/OffNetSec/ - FSU - Offensive Network Security