v0.2.0-alpha.1

• The parser API has been rewritten. The new entry points are FromBufferJsonReader, FromReadJsonReader, and LowLevelJsonReader.
• The serializer API has been rewritten. The new entry points are ToWriteJsonWriter and LowLevelJsonWriter.
• The parser now returns ParseError and SyntaxError types instead of std::io::Error.
• Added support of UTF-8 byte-order-mark (BOM) during parsing.
• Added support of Tokio AsyncRead and AsyncWrite interfaces behind the async-tokio feature.
• Escaped unicode surrogate pairs are now carefully validated.
• Minimal supported Rust version has been bumped to 1.70.