v2.0.0 -> v2.1.0

Features

• a369718 ringbuffer: Treat empty ringbuffer as error

Documentation

• 778ab68 README: add codecov.io badge
• d3fc751 CHANGELOG.md: add entry for v2.0.0
• 178bc7c README: fix Go report card badge

Maintenance

• 7123b6a transport: Refactor to use pluggable Aggregator component...
• ba819b0 Dockerfile: Remove WORKFLOW_RELEASE env var