Feature request: UMD export

[Finesse]

Hi! The library is great but in has a disadvantage: it doesn't support Common JS import (i.e. const workly = require('workly');).

I understand that NodeJS doesn't support web workers but CJS is used in other cases, e.g. in Electron (which supports both browser and NodeJS APIs) or bundling JS files using Rollup.

I thing exporting the library in the UMD format is a great solution.

[pshihn]

Thanks. I was planning this, never got around to it. Ideally, I'd want to create multiple build outputs. workly.js, workly.umd.js, etc.