1.4.0

What's Changed

• test: add worker unit tests by @w-h-a in #63
• test: setup integration testing by @w-h-a in #64
• test: add coordinator unit tests by @w-h-a in #65
• test: add integration test suite by @w-h-a in #66
• test: improve worker+coordinator integration tests by @w-h-a in #67
• style: give me a space by @w-h-a in #68
• feat: introduce nats as an optional broker by @w-h-a in #69

Full Changelog: 1.3.4...1.4.0