Update README.md

Author: r4j0x00

README.md

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 # exploits
 
 [CVE-2021-3156](https://github.com/r4j0x00/exploits/blob/master/CVE-2021-3156/exploit.c): Linux local privilege escalation through heap overflow in sudo ([Demo](https://twitter.com/r4j0x00/status/1355489323794108417))  
+[CVE-2021-3156 One shot exploit](https://github.com/r4j0x00/exploits/tree/master/CVE-2021-3156_one_shot)  
 [CVE-2020-6507](https://github.com/r4j0x00/exploits/blob/master/chrome-exploit/exploit.js): Out of bounds write in V8. Chrome versions <= 83.0.4103.97