we need -Xfatal-warnings, definitely

practice what we preach

Author: SethTisue

build.sbt

@@ -22,7 +22,7 @@ publishTo := Some(typesafeIvyReleases)
 
 publishMavenStyle := false
 
-scalacOptions ++= Seq("-unchecked", "-deprecation", "-feature")
+scalacOptions ++= Seq("-unchecked", "-deprecation", "-feature", "-Xfatal-warnings")
 
 licenses += ("Apache-2.0", url("https://www.apache.org/licenses/LICENSE-2.0.html"))