edit gihub_url

Author: khel-kim

_authors/k2h7913.md

@@ -3,7 +3,7 @@ short_name: k2h7913
 name: Khel Kim, 김현호
 position: Cheif Editor
 email: cafehero123@gmail.com, k2h7913@daum.net
-github_url: "https://github.com/k2h7913"
+github_url: "https://github.com/khelkim"
 blog_url: "https://unsolvedproblem.github.io"
 ---
 ### Khel Kim, 김현호