Upgraded to the ivy-s3-resolver v0.6.0; added release notes
Setting version to 0.12.0:

* Upgraded to the ivy-s3-resolver [`v0.6.0`](https://github.com/ohnosequences/ivy-s3-resolver/releases/tag/v0.6.0). See [ohnosequences/sbt-s3-resolver#31](https://github.com/ohnosequences/sbt-s3-resolver/issues/31).
Setting version to '0.13.0-SNAPSHOT'