Resolve "external backup on borg"

Closes #40 (closed)

roles/ynh_backup/tasks/borgbackup.yml

@@ -20,7 +20,7 @@
 - name: Download BorgBackup role on localhost
   local_action:
     module: ansible.builtin.command 
-    cmd: ansible-galaxy install -r requirements.yml
+    cmd: ansible-galaxy install m3nu.ansible_role_borgbackup,v0.9.0 -p ~/.ansible/roles
   become: False
 
 - name: run BorgBackup role