Correcting indentation for 'validate' param

tasks/main.yml

@@ -26,7 +26,7 @@
     owner: root
     group: root
     mode: 0644
-  validate: 'nginx -t -c %s'
+    validate: 'nginx -t -c %s'
   notify: restart nginx
 
 - name: Ensure nginx is started and enabled to start at boot.