Update CONTRIBUTORS.md (#516)

Fix the typo for the link.

CONTRIBUTORS.md

@@ -93,4 +93,4 @@
 - [Peter Duchnovsky](https://pduchnovsky.com)
 - [Alex Miranda](https://ammiranda.com)
 - [Alphonse Mariya](https://github.com/alfunx)
-- [Ziwei Pan])(https://github.com/PanZiwei/)
+- [Ziwei Pan](https://github.com/PanZiwei/)