Merge branch 'master' of github.com:trimstray/the-book-of-secret-knowledge into develop

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

README.md

@@ -1270,6 +1270,7 @@ AWS deployment tool.<br>
 &nbsp;&nbsp;:small_orange_diamond: <a href="https://www.hacker101.com/"><b>Hacker101</b></a> - is a free class for web security.<br>
 &nbsp;&nbsp;:small_orange_diamond: <a href="https://contained.af/"><b>contained.af</b></a> - a stupid game for learning about containers, capabilities, and syscalls.<br>
 &nbsp;&nbsp;:small_orange_diamond: <a href="http://flaws.cloud/"><b>flAWS challenge!</b></a> - a series of levels you'll learn about common mistakes and gotchas when using AWS.<br>
+&nbsp;&nbsp;:small_orange_diamond: <a href="https://cybersecurity.wtf"><b>CyberSec WTF</b></a> - provides web hacking challenges derived from bounty write-ups.<br>
 </p>
 
 ##### :black_small_square: Other resources