Upgrade Scala version patch levels in preparation for Scala Native support

Author: LeeTibbert

.travis.yml

@@ -2,8 +2,8 @@ language: scala
 
 scala:
   - 2.11.12
-  - 2.12.10
-  - 2.13.1
+  - 2.12.13
+  - 2.13.4
 jdk:
   - openjdk8
 env:

build.sbt

@@ -4,7 +4,7 @@ import sbtcrossproject.{crossProject, CrossType}
 val previousVersion = "1.0.0"
 
 inThisBuild(Def.settings(
-  crossScalaVersions := Seq("2.12.10", "2.11.12", "2.13.1"),
+  crossScalaVersions := Seq("2.12.13", "2.11.12", "2.13.4"),
   scalaVersion := crossScalaVersions.value.head,
   version := "1.1.0-SNAPSHOT",
   organization := "org.portable-scala",