v0.3.0

Thank you @nielsmeima, and @teymour-aldridge for your contributions to this release!

Features and Enhancements

• Add support for converting to Chunk @ncpenke #44
• Add support for i128 @ncpenke #48
• Add support for enums @ncpenke #37
• Flatten chunks @nielsmeima #56
• Serialize escaped Rust identifiers unescaped. @teymour-aldridge #59
• Update arrow2 version. @teymour-aldridge #61

Full Changelog: v0.2.0...v0.3.0