changed to correct emoji

Author: YellowFoxH4XOR

README.md

@@ -149,10 +149,10 @@ But knowing the stuff will help you become better! :muscle:*
 - [Dev.To](https://dev.to/)
 - [Stackoverflow](https://stackoverflow.com/)
 ### Coding Practice Sites :zap:
-- :white_check_mark: [CodeForces](http://codeforces.com/)
-- :white_check_mark: [CodeChef](https://www.codechef.com)
-- :white_check_mark: [Cs Academy](https://csacademy.com/)
-- :white_check_mark: [HackerRank](https://hackerrank.com/)
-- :white_check_mark: [Spoj](https://spoj.com/)
-- :white_check_mark: [HackerEarth](https://hackerearth.com/)
-- :white_check_mark: [TopCoder](https://www.topcoder.com/)
+- :link: [CodeForces](http://codeforces.com/)
+- :link: [CodeChef](https://www.codechef.com)
+- :link: [Cs Academy](https://csacademy.com/)
+- :link: [HackerRank](https://hackerrank.com/)
+- :link: [Spoj](https://spoj.com/)
+- :link: [HackerEarth](https://hackerearth.com/)
+- :link: [TopCoder](https://www.topcoder.com/)