add angstromctf.com (#3582)

* -_-

* add refactoring

* add refactoring

Co-authored-by: rndd <you@example.com>
pull/3590/head
rndd 2020-04-16 15:20:44 +00:00 committed by GitHub
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@ -39,6 +39,7 @@
### Information security
* [ångstromCTF](https://angstromctf.com)
* [CTFtime](https://ctftime.org)