circe-iteratee 0.9.0-M2

Note that this release is superseded by the almost identical 0.9.0-M3.

This is the first release of circe-iteratee, a renamed version of circe-streaming. It is the first release under either name for Cats 1.0.0-RC1, and depends on circe 0.9.0-M2 and iteratee.io 0.15.0.

Many thanks to @dwijnand for kicking off the upgrade and to @aeons for splitting out the project into its own repository.