Update README.md

Author: rafaelpadilla

README.md

@@ -19,7 +19,7 @@ In the topics below you can find an overview of the most popular metrics used in
 - [Metrics](#metrics)
   - [Precision x Recall curve](#precision-x-recall-curve)
   - [Average Precision](#average-precision)
-- [How to use this project](#how-to-use-this-project)
+- [**How to use this project**](#how-to-use-this-project)
 - [References](#references)
 
 <a name="different-competitions-different-metrics"></a>