README.md: Update badge

Author: bzg

README.md

@@ -1,6 +1,5 @@
 [![img](https://img.shields.io/badge/code.gouv.fr-contributif-blue.svg)](https://code.gouv.fr/documentation/#/publier.md)
-
-[![Software License](https://img.shields.io/badge/Licence-MIT%2C%20Licence%20Ouverte-orange.svg?style=flat-square)](https://git.sr.ht/~codegouvfr/codegouvfr-public/tree/main/item/LICENSES)
+[![Software License](https://img.shields.io/badge/Licence-MIT%2C%20Licence%20Ouverte-orange.svg)](https://git.sr.ht/~codegouvfr/codegouvfr-public/tree/main/item/LICENSES)
 
 ![build-preprod](https://img.shields.io/github/actions/workflow/status/codegouvfr/codegouvfr-website/preproduction.yml?label=Deploiement%20en%20préprod)
 ![build-prod](https://img.shields.io/github/actions/workflow/status/codegouvfr/codegouvfr-website/production.yml?label=Deploiement%20en%20prod)