Also mention 0.13
Also mention 0.13

0.13 release announcement mentions this plugin, in this version:

https://groups.google.com/d/msg/simple-build-tool/0AGST5qPbzw/CrN1sJ6ut-AJ

Hence, the README should be updated as well.
xuwei-k/xsbt,sbt/sbt,sbt/sbt,sbt/sbt,mdedetrich/sbt,sbt/sbt,sbt/sbt,xuwei-k/xsbt,xuwei-k/xsbt,mdedetrich/sbt,sbt/sbt,xuwei-k/xsbt,mdedetrich/sbt,mdedetrich/sbt,jrudolph/sbt-dependency-graph,mdedetrich/sbt,mdedetrich/sbt,xuwei-k/xsbt,mdedetrich/sbt,sbt/sbt