Merge pull request #44 from coffman21/coffman21-patch-1

update Coding Practice Sites

Author: mr-mig

README.md

@@ -159,6 +159,6 @@ But knowing the stuff will help you become better! :muscle:*
 - :link: [Spoj](https://spoj.com/)
 - :link: [HackerEarth](https://hackerearth.com/)
 - :link: [TopCoder](https://www.topcoder.com/)
+- :link: [Codewars](http://codewars.com/)
 - :link: [Exercism](http://www.exercism.io/)
 - :link: [CodeFights](https://codefights.com/)
-- :link: [CodeWars](https://www.codewars.com/)