Release 4.0.0

• chore: release script, dropped nodejs 8 and added 14 to ci (#13) (0533268)
• feat: CPU usage stat (#12) (025f8e0)
• Update LICENSE (#10) (0e5b71a)
• Merge pull request #8 from gnought/hotfix/rename_repo (7635a69)
• Rename repo after migrating to a org (76c06a5)
• Merge pull request #7 from gnought/hotfix/fix_ci (ef7868c)
• Update dependencies (#9) (cc064e9)
• Added a license-cheker devDependency (13aa14e)
• Fixed CI and added license checker (71a6264)
• Merge pull request #6 from gnought/feature/enhance_tests (e532b2e)
• Enhance tests - check topic (56ae4b5)
• Refactored unit tests (83a6198)