Query browserslist and caniuse for browser support

[brunocodutra]

I've been fiddling with the idea of querying browserlist and caniuse-api to automatically disable polyfilling browsers that already support the webapp manifest. That's something I really need for webapp-webpack-plugin and it would be great if favicons supported that out of the box.

If you think that makes sense, I'd be glad to work out a PR for it.

[alexander-akait]

@brunocodutra 👍 it will be great feature, we should create package with zero configuration, it is allow people just run and get favicons what they really need

[jantimon]

Maybe you could even release it as an independent package

[alexander-akait]

@jantimon maybe 👍 Anyway PR welcome

[alexander-akait]

@andy128k Regarding to improve default image generation, I think it will be great feature, we can do:

• add to each images browser range
• by default use browserslist default value to generate, i.e. you will get only necessary images