Optional Features

[seanmonstar]

In the next breaking release, for the sake of reducing dependencies when someone doesn't need something, we can put many things behind optional cargo features. Here's a list I've thought of, though I'm less certain which should be enabled by default.

• json: Both sending and receiving JSON bodies.
• cookies: The cookie store integration.
• gzip: Response body GZIP decoding.
• blocking: The current blocking Client (which is built on top of the async client).

[pfernie]

I think cookie would be fine to make non-default; it pulls in a fair few dependencies.

[seanmonstar]

These are all done!