Relax the dependency on http-client.
Relax the dependency on http-client.

`bloodhound` compiles against `http-client-0.6.1` and seems to work fine. The only breaking change in the new `http-client` was in the `renderParts` function, but it looks like `bloodhound` code doesn't make use of it.

Would be nice if you could make a Hackage revision too.
bitemyapp/bloodhound