Benjamin Moss

This PR replaces the `init/0` callback with `after_start/1` (using the old callback still works). In this way, you can for example use ecto dynamic repos with `Commanded.Projections.Ecto`, e.g. ```elixir defmodule...

* Adds Elixir 1.13 - 1.17 with their latest supported OTP to the Test matrix * Compiles with errors as warnings * Disables mix format check for versions under 1.15...

Remember the generated stream_id across batches of events being appeneded.

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Addresses #283 By returning and remembering `stream_id` created in the first batch, then subsequent batches no longer fail with a duplicate stream_uuid constraint error. This has been a long standing...

While there is a docker command line mentioned in the README file, I'm proposing we add a Docker Compose file to make that a 1 liner.