updated 'Security'

- signed-off-by: trimstray <trimstray@gmail.com>

README.md

@@ -237,6 +237,7 @@ performance of any of your sites from across the globe.<br>
 <p>
 &nbsp;&nbsp;:small_orange_diamond: <a href="https://www.owasp.org/index.php/Main_Page"><b>OWASP</b></a> - worldwide not-for-profit charitable organization focused on improving the security of software.<br>
 &nbsp;&nbsp;:small_orange_diamond: <a href="http://www.hackingarticles.in/"><b>Hacking Articles</b></a> - LRaj Chandel's Security & Hacking Blog.<br>
+&nbsp;&nbsp;:small_orange_diamond: <a href="https://gtfobins.github.io/"><b>GTFOBins</b></a> - list of Unix binaries that can be exploited by an attacker to bypass local security restrictions.<br>
 </p>
 
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