fix format

README.md

@@ -10,7 +10,7 @@ From a programming point of view, the first objectives of this project is to lea
 
 ## Requirements
 you should have completed the following notebooks before starting this project:
-- the [_basics of the Python language](https://gitlab.isae-supaero.fr/mae/learn-python#the-basics-of-the-language)
+- the [basics of the Python language](https://gitlab.isae-supaero.fr/mae/learn-python#the-basics-of-the-language)
 - how to [read and write to text files and write functions](https://gitlab.isae-supaero.fr/mae/learn-python#reading-text-files-and-writing-functions)
 
 ## 1 First occurrence frequency analysis