Missing serializer services in example setup

[UlrichEckhardt]

The services reference broadway.serializer.payload and broadway.serializer.metadata which aren't defined. For simplicity reasons, I'd just do this:

services:
    broadway.event_store.mongodb_client:
        class: MongoDB\Client
        arguments:
            - 'mongodb://%mongodb_host%:%mongodb_port%'

    broadway.event_store.mongodb_collection:
        class: MongoDB\Collection
        factory:
            - '@broadway.event_store.mongodb_client'
            - 'selectCollection'
        arguments:
            - '%mongodb_database%'
            - 'events'

    broadway.serializer:
        class: Broadway\Serializer\ReflectionSerializer

    broadway.event_store.mongodb:
        class: Broadway\EventStore\MongoDB\MongoDBEventStore
        arguments:
            - '@broadway.event_store.mongodb_collection'
            - '@broadway.serializer'
            - '@broadway.serializer'

• This formats argument lists on separate lines (better readability, IMHO).
• It adds a serializer.
• It uses the serializer for both payload and metadata.

[stale]

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