Mise à jour de 'README.md'

README.md

@@ -64,7 +64,7 @@ bash -c "$(curl -sSfL 'https://raw.githubusercontent.com/MichaIng/DietPi/master/
 -reboot to use the DiePi image
 
 
-after reboot password will be:
+**after reboot password will be:**
 
 user : **root**