Question marks are not handled correctly in CSS.parse()

[snehilshah]

Question marks needs \\ as we must also escape the backslash itself, using another backslash, like: "\?". See example in JS section

Minimal reproducible example, this should not fail.

package main

import (
    "fmt"

    "github.com/ericchiang/css"
)

func main() {
    s := "link[href*=css\\\\?family]"

    _, err := css.Parse(s)
    if err != nil {
        fmt.Println("Error: ", err)
    }
}