v0.4.0

What's Changed

• Rewrite using async/await syntax and futures-v0.3 by @sile in #6
• Add new messages by @sile in #7
• Refactor epmd module by @sile in #8
• Refactor handshake module by @sile in #9
• Refactor node module and other misc components by @sile in #10
• Refactor message module by @sile in #11

Full Changelog: 0.3.0...0.4.0