Google demands WordPress sites to remove query strings from their static resources to improve page load performance.
As of July 2018, page speed has become another Google Update and the site that already load fast, there is nothing to worry about.
If you have a running WordPress site with the caching plugin W3 Total Cache already installed, there is an option to remove those messy query strings.
Go to the General Settings tab, tick on the option “Remove query strings from static resources” then hit Save all settings and you’re done.