breaking change notice for mocks in cests. Closes Codeception#3005

updated changelog

updated actions files

RC version

improved BC compat - TestInterface to extend old named TestCase

switched to php-amqplib/php-amqplib for AMQP module

Merge pull request Codeception#2778 from Naktibalda/2.1-object-in-ste…

…p-output

Improved steps output in 2.1 branch

Merge pull request Codeception#2645 from Naktibalda/asserts-hhvm-warning

Added warning to docs that Asserts module does not work on HHVM

fixed PO generator tests

updated changelog