Mettre à jour 'stl/Calibration_cross/README.md'

stl/Calibration_cross/README.md

@@ -1,3 +1,4 @@
+```
                    .:                     :,                                          
 ,:::::::: ::`      :::                   :::                                          
 ,:::::::: ::`      :::                   :::                                          
@@ -15,6 +16,7 @@
                                  ::::::                                               
                                   `,,`
 
+```
 
 https://www.thingiverse.com/thing:2484766
 Calibration cross by lukeskymuh is licensed under the Creative Commons - Attribution license.