What's Changed?

• Adds metadata views to FlowToken (#370)
• Adds RandomBeaconHistory contract (#375)
• Improves Epoch phase performance (#379)
• Adds automatic access node slots (#379)
• Improvements to Epoch events and addition of target duration and target end time (#379)

Full Changelog: lib/go/contracts/v0.13.0...lib/go/contracts/v0.15.0