Initial release polish

This release brings a little level of polish over the initial release.

Changed

Updates

• Do not require static lifetime for bytes bodies (#8) @SfietKonstantin
• Some traits like Debug and Eq are implemented on Json and JsonResult

Added

• Added MSRV information (#10) @SfietKonstantin
• Added examples on how to use pretend (#9) @SfietKonstantin
• Updated links to client crates in the doc (#7) @SfietKonstantin
• Improved tests with more coverage on clients and outputs (#6) @SfietKonstantin
• Updated docs location for crates.io (#5) @SfietKonstantin