This is a maintenance release adding support for sbt 0.13.8.

All changes:

 * [#67](https://github.com/jrudolph/sbt-dependency-graph/issues/67): Added support for sbt 0.13.8. Thanks
   [@eed3si9n](https://github.com/eed3si9n) for the fix.
 * [#37](https://github.com/jrudolph/sbt-dependency-graph/issues/37): Don't fail with StringIndexOutOfBoundsException
   for deep trees.
 * [#44](https://github.com/jrudolph/sbt-dependency-graph/issues/44): Only match scala lib by org/name.
   Thanks [@2beaucoup](https://github.com/2beaucoup) for the fix.