Read-Nexus.md

@@ -72,7 +72,7 @@ Now you can call every methods of your object of class directRead. Here is the l
 
 You can use them by doing: _NameOfYourObject_._NameOfTheMethod_().
 
-3- Installation guide
+## Installation guide
 
 Download **ReadNexus-0.1.0-py3-none-any.whl**.