Update README.md

Author: r4j0x00

README.md

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-# exploits
+# exploits
+
+[CVE-2021-3156](https://github.com/r4j0x00/exploits/blob/master/CVE-2021-3156/exploit.c): heap overflow in sudo
+[CVE-2020-6507](https://github.com/r4j0x00/exploits/tree/master/chrome-exploit): Out of bounds write in V8. Chrome versions <= 83.0.4103.97