Lunatic v0.12.0

Changes

• Compiled modules can now be sent between processes (@tqwewe)
• TLS support added (@SquattingSocrates)
• Metrics added to the VM (@HurricanKai)
• Improvements to distributed lunatic (@kosticmarin)
• Distributed metadata added (@kosticmarin)
• Improved error reporting (@alecthomas)
• TCP read/write timeouts added back (@SquattingSocrates)
• Time API moved from async-std to tokio.rs (@MarkintoshZ)
• FIX: Sender can be dropped during execution (@HurricanKai)
• FIX: Dependency issues (@pinkforest)