0.2.1: Fix set mime types (#7)

* Make setMimeTypes public in Displayer API.

This makes Displayer#setMimeTypes public. This was the original intent,
but since the method wasn't public it is technically an API addition.

* Fix tests broken by setMimeTypes change.

* Version 0.2.1.

Version 0.2.0.

This makes Displayer#setMimeTypes public. This was the original intent,
but since the method wasn't public it is technically an API addition.

Initial release

This is the initial public release of jvm-repr.