Support browser extensions

[lmk123]

The documentation says that this project cannot be used in browsers because of CORS, but in fact browser extensions allow cross-domains.

I hope this project can support use in browser extensions, theoretically just by replacing got with axios.

[vitalets]

In the latest beta release I've replaced got with node-fetch, that actually should work in browser context.
I would appreciate if you try it and share the result!

[lmk123]

Thanks for your work!

node-fetch seems to be supported only in Node.js. Its homepage says this:

See Jason Miller's isomorphic-unfetch or Leonardo Quixada's cross-fetch for isomorphic usage (exports node-fetch for server-side, whatwg-fetch for client-side).

But isomorphic-unfetch has not been updated for two years, and cross-fetch is still using the v2.x version of node-fetch.

Probably axios is still the better solution.

[vitalets]

I've used node-fetch v2 that has browser field in package.json and bundler (webpack) should correctly use built-in fetch.
Also found interesting discussion in node-fetch repo node-fetch/node-fetch#786

[vitalets]

Just checked new v9 - it works in browser extensions.
Added documentation to readme