[BUG] `innerHTML` on elements parsed from XMLDocument doesn't escape characters as XML entities inside attribute values

[omril1]

Repro:

var linkedom = require('linkedom')
var parser = new linkedom.DOMParser()
var doc = parser.parseFromString(`<hierarchy><android.view.View content-desc="text3&amp;more"/></hierarchy>`, 'text/xml')
console.log(doc.documentElement.innerHTML) // '<android.view.View content-desc="text3&more" />'

Using the same code on a DOMParser from a browser or JSDOM gives <android.view.View content-desc="text3&amp;more"/>

[WebReflection]

It's in: https://github.com/WebReflection/linkedom/pull/261