Update README.md

Author: prodseanb

README.md

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 # ctf-writeups
 various CTF attempts/writeups, documenting my learning process as I explore a variety of security challenges.
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-## Sites played:
-- [HackTheBox](https://www.hackthebox.eu/)
-- [CTFLearn](https://ctflearn.com/)
-- [TryHackMe](https://tryhackme.com/)
-- [OverTheWire](https://overthewire.org/)