Mainly a convenience release for the new state of the `coursier spark-submit` command.

### Changes

* Changes in the experimental and subject to change `coursier spark-submit` command, now allowing to launch spark applications without requiring a spark distribution ([#343], [#346]).

[#343]: https://github.com/alexarchambault/coursier/pull/343
[#346]: https://github.com/alexarchambault/coursier/pull/346

### Non-backward compatible changes

* N/A