Release v0.3.0

perun-node v0.3.0 is a complete re-implementation of the previous version (project name changed from dst-go to perun-node). This version uses the go-perun SDK that implements a state
channel client based on perun protocol and builds other functionalities on top of that.

The following features are included:

1. Ethereum backend for blockchain.
2. Key management using ethereum keystore.
3. YAML file based contacts provider.
4. Session (as an abstraction) for enabling multiple users use the same node with dedicated contacts provider and key manager.
5. Two party payment channel API for the user over gRPC protocol.

For detailed information on changes covered in the release, see these milestones: 3, 4, 5, 6, 7, 8, 9.