Update README.md

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Omar Santos 2018-04-05 17:45:57 -04:00 committed by GitHub
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@ -6,3 +6,5 @@ Capture the flag (CTF) is a computer security competition that is designed for e
* http://captf.com
* https://pentesterlab.com/exercises
* http://vulnhub.com
* https://challenges.re/
* http://cryptopals.com/