Fix broken links

Author: shrijitsingh99

gsoc-2020/executors.md

@@ -61,3 +61,9 @@ This project has been a great learning experience. There was a learning curve, b
 
 Kudos to my mentors [@kunaltyagi][kunal]] and [@SergioRAgostinho][sergio].
 Shoutouts to [@aPonza][aponza] and [@larshg][lars] for doing a fabulous job mentoring other projects as well.
+
+[shrijit]: https://github.com/shrijitsingh99
+[kunal]: https://github.com/kunaltyagi
+[sergio]: https://github.com/SergioRAgostinho
+[aponza]: https://github.com/aPonza
+[lars]: https://github.com/larshg