Update dependency com.sksamuel.scapegoat:sbt-scapegoat to v1.2.9 (#163)

Author: renovate[bot]

project/plugins.sbt

@@ -30,7 +30,7 @@ addSbtPlugin("org.danielnixon" % "sbt-extrawarts" % "1.0.3")
 
 // http://github.com/sksamuel/scapegoat
 // http://github.com/sksamuel/sbt-scapegoat
-addSbtPlugin("com.sksamuel.scapegoat" %% "sbt-scapegoat" % "1.2.8")
+addSbtPlugin("com.sksamuel.scapegoat" %% "sbt-scapegoat" % "1.2.9")
 
 // http://github.com/scoverage/sbt-scoverage
 addSbtPlugin("org.scoverage" % "sbt-scoverage" % "2.3.0")