use newer required_one_of syntax; unsure why there's app_name vs appname, so leaving it alone.

lib/ansible/modules/extras/monitoring/newrelic_deployment.py

@@ -102,6 +102,7 @@ def main():
             environment=dict(required=False),
             validate_certs = dict(default='yes', type='bool'),
         ),
+        required_one_of=[['app_name', 'application_id']],
         supports_check_mode=True
     )