Fix Linting (#3)

Fix Linting

roles/matrix-coturn/defaults/main.yml

@@ -65,7 +65,7 @@ matrix_coturn_turn_static_auth_secret: ""
 
 # The external IP address of the machine where Coturn is.
 matrix_coturn_turn_external_ip_address: ''
-matrix_coturn_turn_external_ip_addresses: [ "{{ matrix_coturn_turn_external_ip_address }}" ]
+matrix_coturn_turn_external_ip_addresses: ["{{ matrix_coturn_turn_external_ip_address }}"]
 
 matrix_coturn_allowed_peer_ips: []
 matrix_coturn_denied_peer_ips: []