[DOC] update traefik version to 2.7

README.md

@@ -41,7 +41,7 @@ Variables from vars directory:
 * Global (main.yml):
   * pip_packages: Python pip packages to be installed / upgraded
   * timezone: for Traefik logs (defaults to "Europe/Paris")
-  * traefik_version: "v2.6"
+  * traefik_version: "v2.7"
 
 This role also makes use of variables gathered from facts :
 * ansible_os_family : Family of Operating System (Debian or RedHat)

[Rémi - Le Filament]

@theo-filament quand tu modifies la version par défaut, pense aussi à modifier le README pour aligner, merci !