fix geant_acme.py

files/geant_acme.py

@@ -146,7 +146,7 @@ if __name__ == "__main__":
     if ARGS['--client']:
         CLIENTS = ARGS['--client']
     else:
-        CLIENTS = DOMAIN[0]  # client makes only sense with Puppet
+        CLIENTS = [DOMAIN[0]]  # client makes only sense with Puppet
     WILDCARD = ARGS['--wildcard']
     EXTRA = ARGS['--extra']
     LOG_FILE = '/var/log/acme_{}/geant_acme.log'.format(PROVIDER)