Use yaml syntax

handlers/main.yml

 ---
 - name: restart nginx
-  service: name=nginx state=restarted
+  service:
+    name: nginx
+    state: restarted
 
 - name: validate nginx configuration
   command: nginx -t -c /etc/nginx/nginx.conf
   changed_when: false
 
 - name: reload nginx
-  service: name=nginx state=reloaded
+  service:
+    name: nginx
+    state: reloaded