response encoding error when use XmlHttpRequest

[Mas0nShi]

Describe the bug
response encoding error when use XmlHttpRequest

To Reproduce
we need to compatible encoding e.g. 'gbk'

const window = new Window(), document = window.document;
const xhr = new window.XMLHttpRequest();
xhr.open("GET", "https://blog.shi1011.cn", true);
xhr.send();

xhr.onload = function() {
	console.log(xhr.responseText);
}

[capricorn86]

Thanks again for the contribution @Mas0nShi! 🌟

We can add unit tests later. The current unit tests are passing, which means that nothing essential should break.

You can read more about the release here:
https://github.com/capricorn86/happy-dom/releases/tag/v8.7.6