v0.6.0

Changelog:

• HTTP parser now handles trailers when working with chunked encoding.
• Remove ewe.with_read_body, leaving ewe.read_body as the only option to read the body.
• Improve documentation page by adding headers for each logical section (see smol).
• Improve WebSockets. Users can now specify state with on_init function. WebSocket handler accepts connection, user's state and message. ewe.continue requires user to specify new state.
• Add ewe.send_binary_frame and ewe.send_text_frame, allowing to send messages back to the client.