feat(browser): add detection for Miui Browser

[willamesoares]

Overview

This adds support for detecting Xiaomi MiuiBrowser requested in #433

Test

// window.navigator.userAgent is:
// "Mozilla/5.0 (Linux; U; Android 9; fr-fr; Redmi Note 8 Pro Build/PPR1.180610.011) AppleWebKit/537.36 (KHTML like Gecko) Version/4.0 Chrome/71.0.3578.141 Mobile Safari/537.36 XiaoMi/MiuiBrowser/11.9.3-"

const Bowser = require("bowser");
console.log(Bowser.parse(window.navigator.userAgent));

outputs

{
  browser: { name: 'Miui', version: '11.9.3' },
  os: { name: 'Android', version: '9', versionName: 'Pie' },
  platform: { type: 'mobile' },
  engine: { name: 'Blink' }
}

[coveralls]

Pull Request Test Coverage Report for Build 958

• 5 of 5 (100.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.07%) to 90.587%

---

Totals
Change from base Build 948:	0.07%
Covered Lines:	581
Relevant Lines:	594

---

💛 - Coveralls

[Nigui]

@lancedikson can we have this PR merged with main repo ?

[lancedikson]

@Nigui, yes, sure. Sorry for the delay. Will merge and release it soon!