typo

Author: markhuang1212

README.md

@@ -11,7 +11,7 @@ This is a backend for grading C++ code in a secure and controlled manner.
 
 ## API
 
-[https://app.swaggerhub.com/apis-docs/markhuang1212/CodeGraderCore]()
+https://app.swaggerhub.com/apis-docs/markhuang1212/CodeGraderCore
 
 ## Author