Support php 8

[iusik]

Do you have plans of supporting php 8 ?

Because now there is problems with dependency library: enqueue/amqp-lib

    - enqueue/amqp-lib[dev-master, 0.10.0, ..., 0.10.4] require php ^7.1.3 -> your php version (8.0.1) does not satisfy that requirement.
    - nuwber/rabbitevents v5.7 requires enqueue/amqp-lib ^0.10 -> satisfiable by enqueue/amqp-lib[0.10.0, 0.10.1, 0.10.4, 0.10.x-dev (alias of dev-master)].
    - enqueue/amqp-lib 0.10.x-dev is an alias of enqueue/amqp-lib dev-master and thus requires it to be installed too.
    - Root composer.json requires nuwber/rabbitevents ^5.7 -> satisfiable by nuwber/rabbitevents[v5.7].

[masterjus]

I have, but libraries we depend on - not :(.

php-amqplib/php-amqplib#860

[masterjus]

#66

[masterjus]

Please, check new version. If there'll be any issues feel free to report them.