New browser stats

[tomByrer]

ref: https://github.com/dwyl/goodparts#browser-stats-facts
I didn't know NetMarketShare was a better browser stats source; cheers!

Now (as of 2017-06) IE8 has only 1.65%. Seems older Chrome versions (likely other browsers using older Chromium) are as popular than older IE versions;.
Maybe mention:

• look at your site stats
• guesstimate your target audience; a store selling $200 jeans will be more likely to have newer devices/browsers than a non-profit helps the poor.

[iteles]

@tomByrer Thanks for this! A PR is definitely welcome 😊