Update README.md

[daniel347x]

The documentation for the 'encoding : null' argument does not emphasize that this is necessary for binary response data, something that is not obvious - see http://stackoverflow.com/a/14855016/368896. I've added a parenthetical comment to emphasize this in the documentation. This would have saved me (and hopefully will save others).

[simov]

Yep, I agree that encoding:null is a too clever option. However I would like the wording to be a bit more declarative, and especially I don't like the Warning bits. How about something a bit shorter and less noisy?

Note: if you expect binary data, you should set encoding: null

Binary data can be anything so mentioning PDF and images is useless. In fact this option is related to the next one as well (gzip), in case that you want to receive the gzipped content and handle it by yourself.

[daniel347x]

That's good! I've updated it to match. I did leave it in parentheses, to give the sense that this is a 'heads up'. The note would have saved me!

[simov]

Thanks 👍