fixed markdown link

Author: nlohmann

README.md

@@ -1,7 +1,7 @@
 Flask-SQLAlchemy-Caching
 ========================
 
-This is a fork of (iurisilvio's Flask-SQLAlchemy-Cache)[https://github.com/iurisilvio/Flask-SQLAlchemy-Cache]
+This is a fork of [iurisilvio's Flask-SQLAlchemy-Cache](https://github.com/iurisilvio/Flask-SQLAlchemy-Cache)
 
 A CachingQuery implementation to Flask using Flask-SQLAlchemy and Flask-Caching.