oops forgot to update this when I updated CI

Author: SethTisue

build.sbt

@@ -46,8 +46,8 @@ lazy val defaults = Seq(
   sonatypeProfileName := "com.typesafe",
   scalaVersion := crossScalaVersions.value.last,
   crossScalaVersions := {
-    val supportedScala212Versions = (5 to 19).map(p => s"2.12.$p")
-    val supportedScala213Versions = (0 to 13).map(p => s"2.13.$p")
+    val supportedScala212Versions = (18 to 19).map(p => s"2.12.$p")
+    val supportedScala213Versions = (11 to 13).map(p => s"2.13.$p")
     supportedScala212Versions ++ supportedScala213Versions
   },
   scalaMajorVersion := CrossVersion.partialVersion(scalaVersion.value).get._2.toInt,