fix: Android test RegExp can't match Android 10 or 10.1 and so on

[gitBingxu]

I found the bug on Huawei mate30 which userAgent is "... Android 10 ...", Qrcode.js can not get the correct android version on the device because of the reg.

I fixed it and checked it, there are test cases:

const TEST_CASE = [
    {source: 'android 0', expect: 0},
    {source: 'android 0.1', expect: 0.1},
    {source: 'android 0.1.1', expect: 0.1},
    {source: 'android 10', expect: 10},
    {source: 'android 10.0', expect: 10},
    {source: 'android 11.1', expect: 11.1},
    {source: 'android 11.09.1', expect: 11.09},
    {source: 'android 111.1.1', expect: 111.1}
]

const test = (reg) => {
    return TEST_CASE.every(item => {
        return Number.parseFloat(item.source.match(reg)[1]) === item.expect;
    })
}

test(/android (([0-9])+(\.[0-9]+)?)/i);   // true

Could you please approve it, I think the Qrcode.js is very usefull, Thank you guys~

[Wing-9527]

reference issue #280