event listeners aren't called after updating from 2.3.2 to 2.3.3

[craue]

I have some event listeners registered via

<service id="swiftmailer.transport.eventdispatcher"
        class="Swift_Events_SimpleEventDispatcher" public="false">
    <call method="bindEventListener">
        <argument type="service" id="myListener" />
    </call>
    <!-- some more -->
</service>

which aren't invoked anymore. It seems that commit 69d6c36 (which merged #34) is causing this. Is such a break intended? I don't see a changelog or upgrade guide.

[stof]

The id for this internal service has changed as there is several instances now. If you go overwriting internal services, we don't guarantee BC on it as it is not an official extension point of the bundle.

Registering listeners should be done by registering a Swiftmailer plugin. This is achieved by tagging the service with swiftmailer.<name>.plugin where <name> is the name of the mailer (by default, you have a single mailer named default).
There is actually a BC break on it as it was a swiftmailer.plugin previously and should have been kept this way when implementing #34. I'm in favor on changing this though.

@fabpot On a side note, I think version numbers for SwiftmailerBundle should stop being in sync with Symfony ones (as we already agreed for MonologBundle btw) and use semantic versionning instead. The merge of #"4 between 2.3.2 and 2.3.3 does not make sense from a semver PoV.

[craue]

Thank you!