doc snippets did not help me to migrate to v2

[nicgirault]

Thanks for maintaining this project.

I found the code snippet misleading in the README:

1. I was wondering what is Impression https://github.com/lancedikson/bowser/blob/master/README.md#browser-props-detection. Why do you need it? I would suggest to remove it

2. Since it's written:

const browser = Bowser.getParser(window.navigator.userAgent);
impression.userTechData = browser.parse();
console.log(impression.userTechData);

// outputs
{
  browser: {
    name: "Internet Explorer"
    version: "11.0"
  },
  os: {
    name: "Windows"
    version: "NT 6.3"
    versionName: "8.1"
  },
  platform: {
    type: "desktop"
  },
  engine: {
    name: "Trident"
    version: "7.0"
  }
}

I was expecting to be able to write browser.parse().os but actually not because typescript says the parse method returns void. To output what is written as the output, I had to write: console.log(Bowser.parse(window.navigator.userAgent)).

I think the doc seriously need to be rewrote. If I can share my personal experience, I saw the v2 a couple of weeks ago and tried to migrate and I gave up because of this. Now that I'm taking the time to upgrade my dependencies, I took the time to dig into your code to upgrade but I was also looking for alternatives because I was thinking "it became to complicated..." whereas it is not.

The changelog and release note could also be clearer to know what users have to change to migrate from v1 to v2.