Release 0.42.0

• fix: remove subs only when clean flag is false (#488) (684aa51)
• Bump @types/node from 13.13.6 to 14.0.1 (#485) (8494fe7)
• Bump uuid from 7.0.3 to 8.0.0 (#481) (d5ab3de)
• Bump deps and fixed tests (#479) (5fc092c)
• fix: upgrade aedes in proxy example from 0.40.1 to 0.41.0 (#478) (49276ec)
• Improved clusters example (#476) (b2393ab)
• feat: emptyOutgoingQueue (#474) (ab81dce)
• Update README.md (#471) (24cfa8d)
• Return granted qos in broker subscribe event and better subAck docs (#468) (2955388)