Ampersand in query string gets incorrectly escaped

[joppuyo]

Describe the bug
This seems to be same issue as #5

To Reproduce

Write the following code

Meta::setHrefLang('zh-Hans', 'https://example.com/?foo=bar&lang=zh-hans');

Expected behavior

It outputs

<link rel="alternate" hreflang="zh-Hans" href="https://example.com/?foo=bar&amp;lang=zh-hans">

When it should output

<link rel="alternate" hreflang="zh-Hans" href="https://example.com/?foo=bar&lang=zh-hans">

Screenshots
If applicable, add screenshots to help explain your problem.

Desktop (please complete the following information):

• OS: [e.g. iOS]
• Browser [e.g. chrome, safari]
• Version [e.g. 22]

Smartphone (please complete the following information):

• Device: [e.g. iPhone6]
• OS: [e.g. iOS8.1]
• Browser [e.g. stock browser, safari]
• Version [e.g. 22]

Additional context
Currently I'm replacing all ampersands in my URLs with ESCAPED_AMPERSAND and then other way around after outputting the meta tags. It's not the best way to fix the issue but it works.