Tests

Implement delivery of retain flag (#169) #288

Job	Run time
Test PHP 7.4 using broker [mosquitto-1.6]	1m 45s
Test PHP 7.4 using broker [mosquitto-2.0]	1m 41s
Test PHP 7.4 using broker [hivemq]	1m 49s
Test PHP 7.4 using broker [emqx]	1m 56s
Test PHP 7.4 using broker [rabbitmq]	5m 38s
Test PHP 8.0 using broker [mosquitto-1.6]	2m 11s
Test PHP 8.0 using broker [mosquitto-2.0]	1m 35s
Test PHP 8.0 using broker [hivemq]	1m 54s
Test PHP 8.0 using broker [emqx]	2m 23s
Test PHP 8.0 using broker [rabbitmq]	5m 36s
Test PHP 8.1 using broker [mosquitto-1.6]	1m 46s
Test PHP 8.1 using broker [mosquitto-2.0]	2m 14s
Test PHP 8.1 using broker [hivemq]	1m 48s
Test PHP 8.1 using broker [emqx]	2m 10s
Test PHP 8.1 using broker [rabbitmq]	5m 40s
	40m 6s

Provide feedback