[0.6.0] Upgrade dependencies

Small upgrade of dependencies. Upgrade Hyper to 1.x, this is a breaking change since hyper moved from a distinct Body type to a Body trait. Added a PithosBody that implements hyper::Body to the HyperSink and mimics that old Body::channel() method

Bump version to 0.6.0 from 0.5.1

What's Changed

• Upgrade dependencies, move hyper to 1.x, added custom PithosBody / channel by @St4NNi in #10

Full Changelog: v0.5.1...v0.6.0