Release 0.42.6

• feat: add $SYS/<brokerId>/new/subscribes and $SYS/<brokerId>/new/unsubscribes #540 (#541) (9f8a21a)
• chore(deps-dev): bump release-it from 13.7.1 to 14.0.2 (#539) (b1b3d41)
• Update README.md (#538) (631c32a)
• docs: clusters best practise (#537) (933a0be)
• chore(deps-dev): bump typescript from 3.9.7 to 4.0.2 (#534) (8c2ef56)
• fix: typos in types (#528) (ace19d3)
• docs: examples.md require Aedes without relative path (#523) (6cb9efa)