<?php
function remove_query_string_from_static_res( $src ) {
    if( strpos( $src, '?ver=' ) )
        // Remove version from CSS and JS
        //query string may be variable for version may be `ver` or `v`
        $src = remove_query_arg( array('ver'), $src );
    if( strpos( $src, '?v=' ) )
        $src = remove_query_arg( array('v'), $src );
    return $src;
}
add_filter( 'style_loader_src', 'remove_query_string_from_static_res', 10, 2 );
add_filter( 'script_loader_src', 'remove_query_string_from_static_res', 10, 2 );