Add Codility to Coding Practice Sites

pbitkowski · web-flow · commit fb28a9c1b610 · 2020-07-01T08:58:15.000+02:00
diff --git a/README.md b/README.md
@@ -240,3 +240,4 @@ But knowing the stuff will help you become better! :muscle:*
 - :link: [CodeCombat](https://codecombat.com/)
 - :link: [InterviewCake](https://www.interviewcake.com/)
 - :link: [At Coder](https://atcoder.jp/)
+- :link: [Codility](https://www.codility.com/)
