Release v0.2.0

dst-go v0.2.0 is the second regular development release.

Changes included :

• Refactor channel package into smaller ones (based on functionality), so that the different parts can be modified and developed independently
• Add tests in logger module, to check if the messages are logged as expected.
• Move linting job from golangci.com to circleci system.

For detailed information on changes covered in the release, see this milestone.