Add debug logging

[andywer]

Follow-up of #12.

[pke]

So I think we should at least protocol these steps/events:

https://github.com/andywer/http-event-stream/blob/master/src/stream.ts#L41
https://github.com/andywer/http-event-stream/blob/master/src/stream.ts#L76 (incl the state of stillInCommentBlock)
https://github.com/andywer/http-event-stream/blob/master/src/stream.ts#L81
https://github.com/andywer/http-event-stream/blob/master/src/stream.ts#L85
https://github.com/andywer/http-event-stream/blob/master/src/stream.ts#L89

https://github.com/andywer/http-event-stream/blob/master/src/stream.ts#L107
https://github.com/andywer/http-event-stream/blob/master/src/stream.ts#L110

[andywer]

Looks like you gave this some thought already! Would you mind contributing a PR? 🙂

I would just npm install debug and use it to log what you highlighted.

[pke]

First thing next year ;)