v0.8.0

Changelog:

• Add ewe.stream_body for streaming the request body (including chunked encoding).
• Simplified Builder type.
• Add internal Buffer type.
• Add ewe.quiet for setting empty on_start function.
• Rename multiple functions and types, add aliases for clarity.
• Add ewe.on_close argument for WebSocket upgrade function.
• Add bunch of comments and separated internals into logical sections.