fix(nginx): restart nginx on instance uninstall

no issue
- makes it so nginx picks up the fact that the instance has been removed

Author: acburdine

extensions/nginx/index.js

@@ -264,7 +264,7 @@ class NginxExtension extends cli.Extension {
             );
         }
 
-        return Promise.all(promises);
+        return Promise.all(promises).then(() => this.restartNginx());
     }
 
     _cron(fn) {