Remove dependency on request

[avh4]

Assuming this can be done safely (that there aren't notable features we lose by using nodejs APIs directly), this should be done to remove transitive dependencies.

[harrysarson]

Does the @rtfeldman's pull request #19 not do this?

[avh4]

Ah, yes it does, thanks!

[avh4]

Adding back "help wanted", since #19 needs to be rebased and have the failing tests fixed.

[sporto]

This dependecy has a critical vulnerability, which is problem for security audits.

request depends on form-data 2.3.3
https://github.com/request/request/blob/master/package.json#L36

Which depends on json-schema 0.2.3

json-schema 0.2.3 has a critical vulnerability:
GHSA-896r-f27r-55mw

It would be great if this dependecy could be changed.