fix: correct call to execute webhooks when pact changes

Author: bethesque

lib/pact_broker/pacts/service.rb

@@ -123,7 +123,7 @@ def create_pact params, version, provider
 
       def trigger_webhooks pact
         if pact_has_changed_since_previous_version? pact
-          webhook_service.execute_webhooks pact, PactBroker::Webhooks::WebhookEvent::CONTRACT_CONTENT_CHANGED
+          webhook_service.execute_webhooks pact, nil, PactBroker::Webhooks::WebhookEvent::CONTRACT_CONTENT_CHANGED
         end
       end
     end