feat: make it smaller

[hugomrdias]

clean up a bit package.json
add node 8 and 10 to travis
removes polyfills
removes unused vars and functions

[hugomrdias]

Ping

[hugomrdias]

@maxogden @mafintosh any chance we can get this merged and released ?

[jimmywarting]

Did the same thing in #63 + a bit more without realising you hade already done some of it

[alanshaw]

🙏 🥺 please can we have?

[max-mapper]

@alanshaw added you as a maintainer because I know you IRL :) I'd recommend the next npm publish be a major version just to avoid any potential breakage since this is so widely used

[martinheidegger]

@alanshaw @hugomrdias Would it be possible to add buffer as a dependency to the package.json? (and a var Buffer = require('buffer') statement) to make sure that no extra setup is needed in webpack context?